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Finding the Fourth Proportional to 61,879.60, 85,428.84 and 42,787.36

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Solution

The fourth proportional to 61,879.60, 85,428.84 and 42,787.36 is: 59,070.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,879.60 : 85,428.84 = 42,787.36 : x
  2. Step 2: Convert to fraction form
    61,879.60/85,428.84 = 42,787.36/x
  3. Step 3: Cross multiply
    61,879.60x = 85,428.84 × 42,787.36
  4. Step 4: Simplify right side
    61,879.60x = 3,655,274,531.46
  5. Step 5: Solve for x
    x = 3,655,274,531.46/61,879.60
  6. Step 6: Final answer
    x = 59,070.75

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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.