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Finding the Fourth Proportional to 28,490.72, 42,732.09 and 9,770.45

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Solution

The fourth proportional to 28,490.72, 42,732.09 and 9,770.45 is: 14,654.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,490.72 : 42,732.09 = 9,770.45 : x
  2. Step 2: Convert to fraction form
    28,490.72/42,732.09 = 9,770.45/x
  3. Step 3: Cross multiply
    28,490.72x = 42,732.09 × 9,770.45
  4. Step 4: Simplify right side
    28,490.72x = 417,511,535.08
  5. Step 5: Solve for x
    x = 417,511,535.08/28,490.72
  6. Step 6: Final answer
    x = 14,654.30

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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.