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Finding the Fourth Proportional to 1,225.78, 1,691.54 and 666.23

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Solution

The fourth proportional to 1,225.78, 1,691.54 and 666.23 is: 919.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.78 : 1,691.54 = 666.23 : x
  2. Step 2: Convert to fraction form
    1,225.78/1,691.54 = 666.23/x
  3. Step 3: Cross multiply
    1,225.78x = 1,691.54 × 666.23
  4. Step 4: Simplify right side
    1,225.78x = 1,126,951.75
  5. Step 5: Solve for x
    x = 1,126,951.75/1,225.78
  6. Step 6: Final answer
    x = 919.38

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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.