Home / 13,138.50-18,131.14-9,784.20

Finding the Fourth Proportional to 13,138.50, 18,131.14 and 9,784.20

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Solution

The fourth proportional to 13,138.50, 18,131.14 and 9,784.20 is: 13,502.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.50 : 18,131.14 = 9,784.20 : x
  2. Step 2: Convert to fraction form
    13,138.50/18,131.14 = 9,784.20/x
  3. Step 3: Cross multiply
    13,138.50x = 18,131.14 × 9,784.20
  4. Step 4: Simplify right side
    13,138.50x = 177,398,699.99
  5. Step 5: Solve for x
    x = 177,398,699.99/13,138.50
  6. Step 6: Final answer
    x = 13,502.20

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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.