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Finding the Fourth Proportional to 987.29, 1,362.51 and 655.15

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Solution

The fourth proportional to 987.29, 1,362.51 and 655.15 is: 904.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.29 : 1,362.51 = 655.15 : x
  2. Step 2: Convert to fraction form
    987.29/1,362.51 = 655.15/x
  3. Step 3: Cross multiply
    987.29x = 1,362.51 × 655.15
  4. Step 4: Simplify right side
    987.29x = 892,648.43
  5. Step 5: Solve for x
    x = 892,648.43/987.29
  6. Step 6: Final answer
    x = 904.14

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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.