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Finding the Fourth Proportional to 987.24, 1,479.36 and 661.44

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Solution

The fourth proportional to 987.24, 1,479.36 and 661.44 is: 991.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.24 : 1,479.36 = 661.44 : x
  2. Step 2: Convert to fraction form
    987.24/1,479.36 = 661.44/x
  3. Step 3: Cross multiply
    987.24x = 1,479.36 × 661.44
  4. Step 4: Simplify right side
    987.24x = 978,507.88
  5. Step 5: Solve for x
    x = 978,507.88/987.24
  6. Step 6: Final answer
    x = 991.16

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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.