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Finding the Fourth Proportional to 90,868.80, 136,324.76 and 28,539.30

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Solution

The fourth proportional to 90,868.80, 136,324.76 and 28,539.30 is: 42,815.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,868.80 : 136,324.76 = 28,539.30 : x
  2. Step 2: Convert to fraction form
    90,868.80/136,324.76 = 28,539.30/x
  3. Step 3: Cross multiply
    90,868.80x = 136,324.76 × 28,539.30
  4. Step 4: Simplify right side
    90,868.80x = 3,890,613,080.37
  5. Step 5: Solve for x
    x = 3,890,613,080.37/90,868.80
  6. Step 6: Final answer
    x = 42,815.72

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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.