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Finding the Fourth Proportional to 85,687.74, 128,461.88 and 57,521.90

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Solution

The fourth proportional to 85,687.74, 128,461.88 and 57,521.90 is: 86,236.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,687.74 : 128,461.88 = 57,521.90 : x
  2. Step 2: Convert to fraction form
    85,687.74/128,461.88 = 57,521.90/x
  3. Step 3: Cross multiply
    85,687.74x = 128,461.88 × 57,521.90
  4. Step 4: Simplify right side
    85,687.74x = 7,389,371,880.13
  5. Step 5: Solve for x
    x = 7,389,371,880.13/85,687.74
  6. Step 6: Final answer
    x = 86,236.05

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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.