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Finding the Fourth Proportional to 666.78, 1,001.11 and 569.94

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Solution

The fourth proportional to 666.78, 1,001.11 and 569.94 is: 855.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.78 : 1,001.11 = 569.94 : x
  2. Step 2: Convert to fraction form
    666.78/1,001.11 = 569.94/x
  3. Step 3: Cross multiply
    666.78x = 1,001.11 × 569.94
  4. Step 4: Simplify right side
    666.78x = 570,568.52
  5. Step 5: Solve for x
    x = 570,568.52/666.78
  6. Step 6: Final answer
    x = 855.70

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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.