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Finding the Fourth Proportional to 1,005.69, 1,508.55 and 661.22

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Solution

The fourth proportional to 1,005.69, 1,508.55 and 661.22 is: 991.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.69 : 1,508.55 = 661.22 : x
  2. Step 2: Convert to fraction form
    1,005.69/1,508.55 = 661.22/x
  3. Step 3: Cross multiply
    1,005.69x = 1,508.55 × 661.22
  4. Step 4: Simplify right side
    1,005.69x = 997,475.89
  5. Step 5: Solve for x
    x = 997,475.89/1,005.69
  6. Step 6: Final answer
    x = 991.83

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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.