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Finding the Fourth Proportional to 28,357.78, 42,524.34 and 8,631.76

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Solution

The fourth proportional to 28,357.78, 42,524.34 and 8,631.76 is: 12,943.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,357.78 : 42,524.34 = 8,631.76 : x
  2. Step 2: Convert to fraction form
    28,357.78/42,524.34 = 8,631.76/x
  3. Step 3: Cross multiply
    28,357.78x = 42,524.34 × 8,631.76
  4. Step 4: Simplify right side
    28,357.78x = 367,059,897.04
  5. Step 5: Solve for x
    x = 367,059,897.04/28,357.78
  6. Step 6: Final answer
    x = 12,943.89

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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.