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Finding the Fourth Proportional to 918.12, 1,377.74 and 398.02

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Solution

The fourth proportional to 918.12, 1,377.74 and 398.02 is: 597.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.12 : 1,377.74 = 398.02 : x
  2. Step 2: Convert to fraction form
    918.12/1,377.74 = 398.02/x
  3. Step 3: Cross multiply
    918.12x = 1,377.74 × 398.02
  4. Step 4: Simplify right side
    918.12x = 548,368.07
  5. Step 5: Solve for x
    x = 548,368.07/918.12
  6. Step 6: Final answer
    x = 597.27

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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.