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Finding the Fourth Proportional to 28,507.95, 42,766.79 and 9,789.80

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Solution

The fourth proportional to 28,507.95, 42,766.79 and 9,789.80 is: 14,686.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,507.95 : 42,766.79 = 9,789.80 : x
  2. Step 2: Convert to fraction form
    28,507.95/42,766.79 = 9,789.80/x
  3. Step 3: Cross multiply
    28,507.95x = 42,766.79 × 9,789.80
  4. Step 4: Simplify right side
    28,507.95x = 418,678,057.96
  5. Step 5: Solve for x
    x = 418,678,057.96/28,507.95
  6. Step 6: Final answer
    x = 14,686.36

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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.