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Finding the Fourth Proportional to 72,648.60, 108,989.10 and 56,902.20

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Solution

The fourth proportional to 72,648.60, 108,989.10 and 56,902.20 is: 85,365.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,648.60 : 108,989.10 = 56,902.20 : x
  2. Step 2: Convert to fraction form
    72,648.60/108,989.10 = 56,902.20/x
  3. Step 3: Cross multiply
    72,648.60x = 108,989.10 × 56,902.20
  4. Step 4: Simplify right side
    72,648.60x = 6,201,719,566.02
  5. Step 5: Solve for x
    x = 6,201,719,566.02/72,648.60
  6. Step 6: Final answer
    x = 85,365.99

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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.