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Finding the Fourth Proportional to 78,487.10, 108,311.95 and 42,677.20

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Solution

The fourth proportional to 78,487.10, 108,311.95 and 42,677.20 is: 58,894.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,487.10 : 108,311.95 = 42,677.20 : x
  2. Step 2: Convert to fraction form
    78,487.10/108,311.95 = 42,677.20/x
  3. Step 3: Cross multiply
    78,487.10x = 108,311.95 × 42,677.20
  4. Step 4: Simplify right side
    78,487.10x = 4,622,450,752.54
  5. Step 5: Solve for x
    x = 4,622,450,752.54/78,487.10
  6. Step 6: Final answer
    x = 58,894.40

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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.