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Finding the Fourth Proportional to 1,003.64, 1,385.05 and 561.63

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Solution

The fourth proportional to 1,003.64, 1,385.05 and 561.63 is: 775.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.64 : 1,385.05 = 561.63 : x
  2. Step 2: Convert to fraction form
    1,003.64/1,385.05 = 561.63/x
  3. Step 3: Cross multiply
    1,003.64x = 1,385.05 × 561.63
  4. Step 4: Simplify right side
    1,003.64x = 777,890.47
  5. Step 5: Solve for x
    x = 777,890.47/1,003.64
  6. Step 6: Final answer
    x = 775.07

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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.