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Finding the Fourth Proportional to 1,387.99, 2,080.63 and 565.75

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Solution

The fourth proportional to 1,387.99, 2,080.63 and 565.75 is: 848.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.99 : 2,080.63 = 565.75 : x
  2. Step 2: Convert to fraction form
    1,387.99/2,080.63 = 565.75/x
  3. Step 3: Cross multiply
    1,387.99x = 2,080.63 × 565.75
  4. Step 4: Simplify right side
    1,387.99x = 1,177,116.42
  5. Step 5: Solve for x
    x = 1,177,116.42/1,387.99
  6. Step 6: Final answer
    x = 848.07

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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.