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Finding the Fourth Proportional to 918.74, 1,376.75 and 724.21

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Solution

The fourth proportional to 918.74, 1,376.75 and 724.21 is: 1,085.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.74 : 1,376.75 = 724.21 : x
  2. Step 2: Convert to fraction form
    918.74/1,376.75 = 724.21/x
  3. Step 3: Cross multiply
    918.74x = 1,376.75 × 724.21
  4. Step 4: Simplify right side
    918.74x = 997,059.65
  5. Step 5: Solve for x
    x = 997,059.65/918.74
  6. Step 6: Final answer
    x = 1,085.25

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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.