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Finding the Fourth Proportional to 987.32, 1,363.02 and 673.04

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Solution

The fourth proportional to 987.32, 1,363.02 and 673.04 is: 929.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.32 : 1,363.02 = 673.04 : x
  2. Step 2: Convert to fraction form
    987.32/1,363.02 = 673.04/x
  3. Step 3: Cross multiply
    987.32x = 1,363.02 × 673.04
  4. Step 4: Simplify right side
    987.32x = 917,366.98
  5. Step 5: Solve for x
    x = 917,366.98/987.32
  6. Step 6: Final answer
    x = 929.15

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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.