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Finding the Fourth Proportional to 72,459.60, 108,708.30 and 28,087.80

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Solution

The fourth proportional to 72,459.60, 108,708.30 and 28,087.80 is: 42,139.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,459.60 : 108,708.30 = 28,087.80 : x
  2. Step 2: Convert to fraction form
    72,459.60/108,708.30 = 28,087.80/x
  3. Step 3: Cross multiply
    72,459.60x = 108,708.30 × 28,087.80
  4. Step 4: Simplify right side
    72,459.60x = 3,053,376,988.74
  5. Step 5: Solve for x
    x = 3,053,376,988.74/72,459.60
  6. Step 6: Final answer
    x = 42,139.03

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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.