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Finding the Fourth Proportional to 939.98, 1,409.46 and 666.61

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Solution

The fourth proportional to 939.98, 1,409.46 and 666.61 is: 999.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.98 : 1,409.46 = 666.61 : x
  2. Step 2: Convert to fraction form
    939.98/1,409.46 = 666.61/x
  3. Step 3: Cross multiply
    939.98x = 1,409.46 × 666.61
  4. Step 4: Simplify right side
    939.98x = 939,560.13
  5. Step 5: Solve for x
    x = 939,560.13/939.98
  6. Step 6: Final answer
    x = 999.55

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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.