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Finding the Fourth Proportional to 1,000.70, 1,380.87 and 931.04

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Solution

The fourth proportional to 1,000.70, 1,380.87 and 931.04 is: 1,284.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.70 : 1,380.87 = 931.04 : x
  2. Step 2: Convert to fraction form
    1,000.70/1,380.87 = 931.04/x
  3. Step 3: Cross multiply
    1,000.70x = 1,380.87 × 931.04
  4. Step 4: Simplify right side
    1,000.70x = 1,285,638.30
  5. Step 5: Solve for x
    x = 1,285,638.30/1,000.70
  6. Step 6: Final answer
    x = 1,284.75

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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.