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Finding the Fourth Proportional to 1,225.92, 1,691.78 and 666.36

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Solution

The fourth proportional to 1,225.92, 1,691.78 and 666.36 is: 919.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.92 : 1,691.78 = 666.36 : x
  2. Step 2: Convert to fraction form
    1,225.92/1,691.78 = 666.36/x
  3. Step 3: Cross multiply
    1,225.92x = 1,691.78 × 666.36
  4. Step 4: Simplify right side
    1,225.92x = 1,127,331.19
  5. Step 5: Solve for x
    x = 1,127,331.19/1,225.92
  6. Step 6: Final answer
    x = 919.58

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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.