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Finding the Fourth Proportional to 1,005.81, 1,387.91 and 563.65

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Solution

The fourth proportional to 1,005.81, 1,387.91 and 563.65 is: 777.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.81 : 1,387.91 = 563.65 : x
  2. Step 2: Convert to fraction form
    1,005.81/1,387.91 = 563.65/x
  3. Step 3: Cross multiply
    1,005.81x = 1,387.91 × 563.65
  4. Step 4: Simplify right side
    1,005.81x = 782,294.06
  5. Step 5: Solve for x
    x = 782,294.06/1,005.81
  6. Step 6: Final answer
    x = 777.77

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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.