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Finding the Fourth Proportional to 999.91, 1,380.69 and 607.45

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Solution

The fourth proportional to 999.91, 1,380.69 and 607.45 is: 838.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.91 : 1,380.69 = 607.45 : x
  2. Step 2: Convert to fraction form
    999.91/1,380.69 = 607.45/x
  3. Step 3: Cross multiply
    999.91x = 1,380.69 × 607.45
  4. Step 4: Simplify right side
    999.91x = 838,700.14
  5. Step 5: Solve for x
    x = 838,700.14/999.91
  6. Step 6: Final answer
    x = 838.78

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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.