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Finding the Fourth Proportional to 1,005.89, 1,388.16 and 563.90

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Solution

The fourth proportional to 1,005.89, 1,388.16 and 563.90 is: 778.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.89 : 1,388.16 = 563.90 : x
  2. Step 2: Convert to fraction form
    1,005.89/1,388.16 = 563.90/x
  3. Step 3: Cross multiply
    1,005.89x = 1,388.16 × 563.90
  4. Step 4: Simplify right side
    1,005.89x = 782,776.48
  5. Step 5: Solve for x
    x = 782,776.48/1,005.89
  6. Step 6: Final answer
    x = 778.20

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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.