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Finding the Fourth Proportional to 987.86, 1,362.31 and 633.40

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Solution

The fourth proportional to 987.86, 1,362.31 and 633.40 is: 873.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.86 : 1,362.31 = 633.40 : x
  2. Step 2: Convert to fraction form
    987.86/1,362.31 = 633.40/x
  3. Step 3: Cross multiply
    987.86x = 1,362.31 × 633.40
  4. Step 4: Simplify right side
    987.86x = 862,882.16
  5. Step 5: Solve for x
    x = 862,882.16/987.86
  6. Step 6: Final answer
    x = 873.48

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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.