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Finding the Fourth Proportional to 1,225.96, 1,691.82 and 666.45

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Solution

The fourth proportional to 1,225.96, 1,691.82 and 666.45 is: 919.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.96 : 1,691.82 = 666.45 : x
  2. Step 2: Convert to fraction form
    1,225.96/1,691.82 = 666.45/x
  3. Step 3: Cross multiply
    1,225.96x = 1,691.82 × 666.45
  4. Step 4: Simplify right side
    1,225.96x = 1,127,513.44
  5. Step 5: Solve for x
    x = 1,127,513.44/1,225.96
  6. Step 6: Final answer
    x = 919.70

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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.