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Finding the Fourth Proportional to 1,225.78, 1,691.58 and 666.25

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Solution

The fourth proportional to 1,225.78, 1,691.58 and 666.25 is: 919.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.78 : 1,691.58 = 666.25 : x
  2. Step 2: Convert to fraction form
    1,225.78/1,691.58 = 666.25/x
  3. Step 3: Cross multiply
    1,225.78x = 1,691.58 × 666.25
  4. Step 4: Simplify right side
    1,225.78x = 1,127,006.72
  5. Step 5: Solve for x
    x = 1,127,006.72/1,225.78
  6. Step 6: Final answer
    x = 919.42

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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.