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Finding the Fourth Proportional to 1,105.66, 1,658.40 and 456.40

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Solution

The fourth proportional to 1,105.66, 1,658.40 and 456.40 is: 684.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.66 : 1,658.40 = 456.40 : x
  2. Step 2: Convert to fraction form
    1,105.66/1,658.40 = 456.40/x
  3. Step 3: Cross multiply
    1,105.66x = 1,658.40 × 456.40
  4. Step 4: Simplify right side
    1,105.66x = 756,893.76
  5. Step 5: Solve for x
    x = 756,893.76/1,105.66
  6. Step 6: Final answer
    x = 684.56

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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.