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Finding the Fourth Proportional to 85,431.83, 128,116.15 and 49,905.23

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Solution

The fourth proportional to 85,431.83, 128,116.15 and 49,905.23 is: 74,839.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,431.83 : 128,116.15 = 49,905.23 : x
  2. Step 2: Convert to fraction form
    85,431.83/128,116.15 = 49,905.23/x
  3. Step 3: Cross multiply
    85,431.83x = 128,116.15 × 49,905.23
  4. Step 4: Simplify right side
    85,431.83x = 6,393,665,167.12
  5. Step 5: Solve for x
    x = 6,393,665,167.12/85,431.83
  6. Step 6: Final answer
    x = 74,839.38

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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.