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Finding the Fourth Proportional to 1,005.79, 1,387.99 and 563.71

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Solution

The fourth proportional to 1,005.79, 1,387.99 and 563.71 is: 777.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.79 : 1,387.99 = 563.71 : x
  2. Step 2: Convert to fraction form
    1,005.79/1,387.99 = 563.71/x
  3. Step 3: Cross multiply
    1,005.79x = 1,387.99 × 563.71
  4. Step 4: Simplify right side
    1,005.79x = 782,416.90
  5. Step 5: Solve for x
    x = 782,416.90/1,005.79
  6. Step 6: Final answer
    x = 777.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.