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Finding the Fourth Proportional to 85,903.31, 128,824.07 and 29,728.15

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Solution

The fourth proportional to 85,903.31, 128,824.07 and 29,728.15 is: 44,581.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,903.31 : 128,824.07 = 29,728.15 : x
  2. Step 2: Convert to fraction form
    85,903.31/128,824.07 = 29,728.15/x
  3. Step 3: Cross multiply
    85,903.31x = 128,824.07 × 29,728.15
  4. Step 4: Simplify right side
    85,903.31x = 3,829,700,805.87
  5. Step 5: Solve for x
    x = 3,829,700,805.87/85,903.31
  6. Step 6: Final answer
    x = 44,581.53

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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.