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Finding the Fourth Proportional to 987.97, 1,478.85 and 678.01

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Solution

The fourth proportional to 987.97, 1,478.85 and 678.01 is: 1,014.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.97 : 1,478.85 = 678.01 : x
  2. Step 2: Convert to fraction form
    987.97/1,478.85 = 678.01/x
  3. Step 3: Cross multiply
    987.97x = 1,478.85 × 678.01
  4. Step 4: Simplify right side
    987.97x = 1,002,676.94
  5. Step 5: Solve for x
    x = 1,002,676.94/987.97
  6. Step 6: Final answer
    x = 1,014.88

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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.