Home / 20,699.43-28,549.81-13,139.20

Finding the Fourth Proportional to 20,699.43, 28,549.81 and 13,139.20

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Solution

The fourth proportional to 20,699.43, 28,549.81 and 13,139.20 is: 18,122.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,699.43 : 28,549.81 = 13,139.20 : x
  2. Step 2: Convert to fraction form
    20,699.43/28,549.81 = 13,139.20/x
  3. Step 3: Cross multiply
    20,699.43x = 28,549.81 × 13,139.20
  4. Step 4: Simplify right side
    20,699.43x = 375,121,663.55
  5. Step 5: Solve for x
    x = 375,121,663.55/20,699.43
  6. Step 6: Final answer
    x = 18,122.32

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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.