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Finding the Fourth Proportional to 129,028.32, 178,062.24 and 72,438.24

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Solution

The fourth proportional to 129,028.32, 178,062.24 and 72,438.24 is: 99,966.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,028.32 : 178,062.24 = 72,438.24 : x
  2. Step 2: Convert to fraction form
    129,028.32/178,062.24 = 72,438.24/x
  3. Step 3: Cross multiply
    129,028.32x = 178,062.24 × 72,438.24
  4. Step 4: Simplify right side
    129,028.32x = 12,898,515,276.06
  5. Step 5: Solve for x
    x = 12,898,515,276.06/129,028.32
  6. Step 6: Final answer
    x = 99,966.54

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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.