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Finding the Fourth Proportional to 103,630.60, 155,445.90 and 78,747.40

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Solution

The fourth proportional to 103,630.60, 155,445.90 and 78,747.40 is: 118,121.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,630.60 : 155,445.90 = 78,747.40 : x
  2. Step 2: Convert to fraction form
    103,630.60/155,445.90 = 78,747.40/x
  3. Step 3: Cross multiply
    103,630.60x = 155,445.90 × 78,747.40
  4. Step 4: Simplify right side
    103,630.60x = 12,240,960,465.66
  5. Step 5: Solve for x
    x = 12,240,960,465.66/103,630.60
  6. Step 6: Final answer
    x = 118,121.10

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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.