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Finding the Fourth Proportional to 1,111.66, 1,666.17 and 461.63

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Solution

The fourth proportional to 1,111.66, 1,666.17 and 461.63 is: 691.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.66 : 1,666.17 = 461.63 : x
  2. Step 2: Convert to fraction form
    1,111.66/1,666.17 = 461.63/x
  3. Step 3: Cross multiply
    1,111.66x = 1,666.17 × 461.63
  4. Step 4: Simplify right side
    1,111.66x = 769,158.22
  5. Step 5: Solve for x
    x = 769,158.22/1,111.66
  6. Step 6: Final answer
    x = 691.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.