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Finding the Fourth Proportional to 914.90, 1,369.61 and 861.59

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Solution

The fourth proportional to 914.90, 1,369.61 and 861.59 is: 1,289.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.90 : 1,369.61 = 861.59 : x
  2. Step 2: Convert to fraction form
    914.90/1,369.61 = 861.59/x
  3. Step 3: Cross multiply
    914.90x = 1,369.61 × 861.59
  4. Step 4: Simplify right side
    914.90x = 1,180,036.92
  5. Step 5: Solve for x
    x = 1,180,036.92/914.90
  6. Step 6: Final answer
    x = 1,289.81

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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.