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Finding the Fourth Proportional to 914.20, 1,368.42 and 891.16

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Solution

The fourth proportional to 914.20, 1,368.42 and 891.16 is: 1,333.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.20 : 1,368.42 = 891.16 : x
  2. Step 2: Convert to fraction form
    914.20/1,368.42 = 891.16/x
  3. Step 3: Cross multiply
    914.20x = 1,368.42 × 891.16
  4. Step 4: Simplify right side
    914.20x = 1,219,481.17
  5. Step 5: Solve for x
    x = 1,219,481.17/914.20
  6. Step 6: Final answer
    x = 1,333.93

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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.