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Finding the Fourth Proportional to 1,000.13, 1,380.78 and 646.20

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Solution

The fourth proportional to 1,000.13, 1,380.78 and 646.20 is: 892.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.13 : 1,380.78 = 646.20 : x
  2. Step 2: Convert to fraction form
    1,000.13/1,380.78 = 646.20/x
  3. Step 3: Cross multiply
    1,000.13x = 1,380.78 × 646.20
  4. Step 4: Simplify right side
    1,000.13x = 892,260.04
  5. Step 5: Solve for x
    x = 892,260.04/1,000.13
  6. Step 6: Final answer
    x = 892.15

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1.5x scale

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.