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Finding the Fourth Proportional to 72,438.40, 108,657.60 and 51,443.20

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Solution

The fourth proportional to 72,438.40, 108,657.60 and 51,443.20 is: 77,164.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,438.40 : 108,657.60 = 51,443.20 : x
  2. Step 2: Convert to fraction form
    72,438.40/108,657.60 = 51,443.20/x
  3. Step 3: Cross multiply
    72,438.40x = 108,657.60 × 51,443.20
  4. Step 4: Simplify right side
    72,438.40x = 5,589,694,648.32
  5. Step 5: Solve for x
    x = 5,589,694,648.32/72,438.40
  6. Step 6: Final answer
    x = 77,164.80

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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.