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Finding the Fourth Proportional to 1,105.60, 1,658.08 and 890.08

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Solution

The fourth proportional to 1,105.60, 1,658.08 and 890.08 is: 1,334.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.60 : 1,658.08 = 890.08 : x
  2. Step 2: Convert to fraction form
    1,105.60/1,658.08 = 890.08/x
  3. Step 3: Cross multiply
    1,105.60x = 1,658.08 × 890.08
  4. Step 4: Simplify right side
    1,105.60x = 1,475,823.85
  5. Step 5: Solve for x
    x = 1,475,823.85/1,105.60
  6. Step 6: Final answer
    x = 1,334.86

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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.