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Finding the Fourth Proportional to 28,000.89, 42,001.88 and 8,279.42

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Solution

The fourth proportional to 28,000.89, 42,001.88 and 8,279.42 is: 12,419.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,000.89 : 42,001.88 = 8,279.42 : x
  2. Step 2: Convert to fraction form
    28,000.89/42,001.88 = 8,279.42/x
  3. Step 3: Cross multiply
    28,000.89x = 42,001.88 × 8,279.42
  4. Step 4: Simplify right side
    28,000.89x = 347,750,953.90
  5. Step 5: Solve for x
    x = 347,750,953.90/28,000.89
  6. Step 6: Final answer
    x = 12,419.28

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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.