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Finding the Fourth Proportional to 666.65, 1,000.08 and 301.55

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Solution

The fourth proportional to 666.65, 1,000.08 and 301.55 is: 452.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.65 : 1,000.08 = 301.55 : x
  2. Step 2: Convert to fraction form
    666.65/1,000.08 = 301.55/x
  3. Step 3: Cross multiply
    666.65x = 1,000.08 × 301.55
  4. Step 4: Simplify right side
    666.65x = 301,569.12
  5. Step 5: Solve for x
    x = 301,569.12/666.65
  6. Step 6: Final answer
    x = 452.36

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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.