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Finding the Fourth Proportional to 72,920.20, 109,380.30 and 46,654.60

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Solution

The fourth proportional to 72,920.20, 109,380.30 and 46,654.60 is: 69,981.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,920.20 : 109,380.30 = 46,654.60 : x
  2. Step 2: Convert to fraction form
    72,920.20/109,380.30 = 46,654.60/x
  3. Step 3: Cross multiply
    72,920.20x = 109,380.30 × 46,654.60
  4. Step 4: Simplify right side
    72,920.20x = 5,103,094,144.38
  5. Step 5: Solve for x
    x = 5,103,094,144.38/72,920.20
  6. Step 6: Final answer
    x = 69,981.90

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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.