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Finding the Fourth Proportional to 666.76, 1,000.13 and 374.09

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Solution

The fourth proportional to 666.76, 1,000.13 and 374.09 is: 561.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.76 : 1,000.13 = 374.09 : x
  2. Step 2: Convert to fraction form
    666.76/1,000.13 = 374.09/x
  3. Step 3: Cross multiply
    666.76x = 1,000.13 × 374.09
  4. Step 4: Simplify right side
    666.76x = 374,138.63
  5. Step 5: Solve for x
    x = 374,138.63/666.76
  6. Step 6: Final answer
    x = 561.13

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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.