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Finding the Fourth Proportional to 85,431.78, 128,125.50 and 25,446.24

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Solution

The fourth proportional to 85,431.78, 128,125.50 and 25,446.24 is: 38,162.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,431.78 : 128,125.50 = 25,446.24 : x
  2. Step 2: Convert to fraction form
    85,431.78/128,125.50 = 25,446.24/x
  3. Step 3: Cross multiply
    85,431.78x = 128,125.50 × 25,446.24
  4. Step 4: Simplify right side
    85,431.78x = 3,260,312,223.12
  5. Step 5: Solve for x
    x = 3,260,312,223.12/85,431.78
  6. Step 6: Final answer
    x = 38,162.76

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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.