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Finding the Fourth Proportional to 1,387.18, 2,080.72 and 565.25

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Solution

The fourth proportional to 1,387.18, 2,080.72 and 565.25 is: 847.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.18 : 2,080.72 = 565.25 : x
  2. Step 2: Convert to fraction form
    1,387.18/2,080.72 = 565.25/x
  3. Step 3: Cross multiply
    1,387.18x = 2,080.72 × 565.25
  4. Step 4: Simplify right side
    1,387.18x = 1,176,117.99
  5. Step 5: Solve for x
    x = 1,176,117.99/1,387.18
  6. Step 6: Final answer
    x = 847.85

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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.