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Finding the Fourth Proportional to 918.16, 1,377.28 and 268.89

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Solution

The fourth proportional to 918.16, 1,377.28 and 268.89 is: 403.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.16 : 1,377.28 = 268.89 : x
  2. Step 2: Convert to fraction form
    918.16/1,377.28 = 268.89/x
  3. Step 3: Cross multiply
    918.16x = 1,377.28 × 268.89
  4. Step 4: Simplify right side
    918.16x = 370,341.31
  5. Step 5: Solve for x
    x = 370,341.31/918.16
  6. Step 6: Final answer
    x = 403.35

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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.