Home / 86,431.28-129,646.89-20,767.28

Finding the Fourth Proportional to 86,431.28, 129,646.89 and 20,767.28

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Solution

The fourth proportional to 86,431.28, 129,646.89 and 20,767.28 is: 31,150.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,431.28 : 129,646.89 = 20,767.28 : x
  2. Step 2: Convert to fraction form
    86,431.28/129,646.89 = 20,767.28/x
  3. Step 3: Cross multiply
    86,431.28x = 129,646.89 × 20,767.28
  4. Step 4: Simplify right side
    86,431.28x = 2,692,413,265.76
  5. Step 5: Solve for x
    x = 2,692,413,265.76/86,431.28
  6. Step 6: Final answer
    x = 31,150.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.