Home / 13,219.99-18,238.59-8,440.12

Finding the Fourth Proportional to 13,219.99, 18,238.59 and 8,440.12

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Solution

The fourth proportional to 13,219.99, 18,238.59 and 8,440.12 is: 11,644.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,219.99 : 18,238.59 = 8,440.12 : x
  2. Step 2: Convert to fraction form
    13,219.99/18,238.59 = 8,440.12/x
  3. Step 3: Cross multiply
    13,219.99x = 18,238.59 × 8,440.12
  4. Step 4: Simplify right side
    13,219.99x = 153,935,888.23
  5. Step 5: Solve for x
    x = 153,935,888.23/13,219.99
  6. Step 6: Final answer
    x = 11,644.18

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.