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Finding the Fourth Proportional to 28,581.80, 42,872.70 and 7,805.30

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Solution

The fourth proportional to 28,581.80, 42,872.70 and 7,805.30 is: 11,707.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,581.80 : 42,872.70 = 7,805.30 : x
  2. Step 2: Convert to fraction form
    28,581.80/42,872.70 = 7,805.30/x
  3. Step 3: Cross multiply
    28,581.80x = 42,872.70 × 7,805.30
  4. Step 4: Simplify right side
    28,581.80x = 334,634,285.31
  5. Step 5: Solve for x
    x = 334,634,285.31/28,581.80
  6. Step 6: Final answer
    x = 11,707.95

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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.