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Finding the Fourth Proportional to 918.24, 1,371 and 909

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Solution

The fourth proportional to 918.24, 1,371 and 909 is: 1,357.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.24 : 1,371 = 909 : x
  2. Step 2: Convert to fraction form
    918.24/1,371 = 909/x
  3. Step 3: Cross multiply
    918.24x = 1,371 × 909
  4. Step 4: Simplify right side
    918.24x = 1,246,239
  5. Step 5: Solve for x
    x = 1,246,239/918.24
  6. Step 6: Final answer
    x = 1,357.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.