Home / 13,130.75-18,121.16-8,423.03

Finding the Fourth Proportional to 13,130.75, 18,121.16 and 8,423.03

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Solution

The fourth proportional to 13,130.75, 18,121.16 and 8,423.03 is: 11,624.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,130.75 : 18,121.16 = 8,423.03 : x
  2. Step 2: Convert to fraction form
    13,130.75/18,121.16 = 8,423.03/x
  3. Step 3: Cross multiply
    13,130.75x = 18,121.16 × 8,423.03
  4. Step 4: Simplify right side
    13,130.75x = 152,635,140.68
  5. Step 5: Solve for x
    x = 152,635,140.68/13,130.75
  6. Step 6: Final answer
    x = 11,624.25

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Half scale
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Double scale
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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.