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Finding the Fourth Proportional to 1,000.53, 1,380.33 and 646.41

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Solution

The fourth proportional to 1,000.53, 1,380.33 and 646.41 is: 891.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.53 : 1,380.33 = 646.41 : x
  2. Step 2: Convert to fraction form
    1,000.53/1,380.33 = 646.41/x
  3. Step 3: Cross multiply
    1,000.53x = 1,380.33 × 646.41
  4. Step 4: Simplify right side
    1,000.53x = 892,259.12
  5. Step 5: Solve for x
    x = 892,259.12/1,000.53
  6. Step 6: Final answer
    x = 891.79

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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.