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Finding the Fourth Proportional to 72,123.60, 108,185.46 and 18,815.52

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Solution

The fourth proportional to 72,123.60, 108,185.46 and 18,815.52 is: 28,223.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,123.60 : 108,185.46 = 18,815.52 : x
  2. Step 2: Convert to fraction form
    72,123.60/108,185.46 = 18,815.52/x
  3. Step 3: Cross multiply
    72,123.60x = 108,185.46 × 18,815.52
  4. Step 4: Simplify right side
    72,123.60x = 2,035,565,686.34
  5. Step 5: Solve for x
    x = 2,035,565,686.34/72,123.60
  6. Step 6: Final answer
    x = 28,223.30

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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.