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Finding the Fourth Proportional to 1,225.56, 1,691.28 and 666.03

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Solution

The fourth proportional to 1,225.56, 1,691.28 and 666.03 is: 919.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.56 : 1,691.28 = 666.03 : x
  2. Step 2: Convert to fraction form
    1,225.56/1,691.28 = 666.03/x
  3. Step 3: Cross multiply
    1,225.56x = 1,691.28 × 666.03
  4. Step 4: Simplify right side
    1,225.56x = 1,126,443.22
  5. Step 5: Solve for x
    x = 1,126,443.22/1,225.56
  6. Step 6: Final answer
    x = 919.13

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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.