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Finding the Fourth Proportional to 28,098.48, 42,147.72 and 8,390.88

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Solution

The fourth proportional to 28,098.48, 42,147.72 and 8,390.88 is: 12,586.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,098.48 : 42,147.72 = 8,390.88 : x
  2. Step 2: Convert to fraction form
    28,098.48/42,147.72 = 8,390.88/x
  3. Step 3: Cross multiply
    28,098.48x = 42,147.72 × 8,390.88
  4. Step 4: Simplify right side
    28,098.48x = 353,656,460.79
  5. Step 5: Solve for x
    x = 353,656,460.79/28,098.48
  6. Step 6: Final answer
    x = 12,586.32

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1.5x scale

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.