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Finding the Fourth Proportional to 987.92, 1,363.72 and 678.48

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Solution

The fourth proportional to 987.92, 1,363.72 and 678.48 is: 936.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.92 : 1,363.72 = 678.48 : x
  2. Step 2: Convert to fraction form
    987.92/1,363.72 = 678.48/x
  3. Step 3: Cross multiply
    987.92x = 1,363.72 × 678.48
  4. Step 4: Simplify right side
    987.92x = 925,256.75
  5. Step 5: Solve for x
    x = 925,256.75/987.92
  6. Step 6: Final answer
    x = 936.57

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.