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Finding the Fourth Proportional to 1,003.72, 1,385.20 and 561.66

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Solution

The fourth proportional to 1,003.72, 1,385.20 and 561.66 is: 775.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.72 : 1,385.20 = 561.66 : x
  2. Step 2: Convert to fraction form
    1,003.72/1,385.20 = 561.66/x
  3. Step 3: Cross multiply
    1,003.72x = 1,385.20 × 561.66
  4. Step 4: Simplify right side
    1,003.72x = 778,011.43
  5. Step 5: Solve for x
    x = 778,011.43/1,003.72
  6. Step 6: Final answer
    x = 775.13

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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.