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Finding the Fourth Proportional to 918.11, 1,374.74 and 552.40

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Solution

The fourth proportional to 918.11, 1,374.74 and 552.40 is: 827.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.11 : 1,374.74 = 552.40 : x
  2. Step 2: Convert to fraction form
    918.11/1,374.74 = 552.40/x
  3. Step 3: Cross multiply
    918.11x = 1,374.74 × 552.40
  4. Step 4: Simplify right side
    918.11x = 759,402.25
  5. Step 5: Solve for x
    x = 759,402.25/918.11
  6. Step 6: Final answer
    x = 827.13

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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.