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Finding the Fourth Proportional to 1,225.65, 1,691.38 and 666.13

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Solution

The fourth proportional to 1,225.65, 1,691.38 and 666.13 is: 919.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.65 : 1,691.38 = 666.13 : x
  2. Step 2: Convert to fraction form
    1,225.65/1,691.38 = 666.13/x
  3. Step 3: Cross multiply
    1,225.65x = 1,691.38 × 666.13
  4. Step 4: Simplify right side
    1,225.65x = 1,126,678.96
  5. Step 5: Solve for x
    x = 1,126,678.96/1,225.65
  6. Step 6: Final answer
    x = 919.25

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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.