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Finding the Fourth Proportional to 78,487.92, 108,312.80 and 42,677.01

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Solution

The fourth proportional to 78,487.92, 108,312.80 and 42,677.01 is: 58,893.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,487.92 : 108,312.80 = 42,677.01 : x
  2. Step 2: Convert to fraction form
    78,487.92/108,312.80 = 42,677.01/x
  3. Step 3: Cross multiply
    78,487.92x = 108,312.80 × 42,677.01
  4. Step 4: Simplify right side
    78,487.92x = 4,622,466,235.34
  5. Step 5: Solve for x
    x = 4,622,466,235.34/78,487.92
  6. Step 6: Final answer
    x = 58,893.98

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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.