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Finding the Fourth Proportional to 1,003.52, 1,507.84 and 661.76

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Solution

The fourth proportional to 1,003.52, 1,507.84 and 661.76 is: 994.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.52 : 1,507.84 = 661.76 : x
  2. Step 2: Convert to fraction form
    1,003.52/1,507.84 = 661.76/x
  3. Step 3: Cross multiply
    1,003.52x = 1,507.84 × 661.76
  4. Step 4: Simplify right side
    1,003.52x = 997,828.20
  5. Step 5: Solve for x
    x = 997,828.20/1,003.52
  6. Step 6: Final answer
    x = 994.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.