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Finding the Fourth Proportional to 914.12, 1,367.70 and 911.80

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Solution

The fourth proportional to 914.12, 1,367.70 and 911.80 is: 1,364.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.12 : 1,367.70 = 911.80 : x
  2. Step 2: Convert to fraction form
    914.12/1,367.70 = 911.80/x
  3. Step 3: Cross multiply
    914.12x = 1,367.70 × 911.80
  4. Step 4: Simplify right side
    914.12x = 1,247,068.86
  5. Step 5: Solve for x
    x = 1,247,068.86/914.12
  6. Step 6: Final answer
    x = 1,364.23

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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.