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Finding the Fourth Proportional to 918.98, 1,378.50 and 269.72

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Solution

The fourth proportional to 918.98, 1,378.50 and 269.72 is: 404.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.98 : 1,378.50 = 269.72 : x
  2. Step 2: Convert to fraction form
    918.98/1,378.50 = 269.72/x
  3. Step 3: Cross multiply
    918.98x = 1,378.50 × 269.72
  4. Step 4: Simplify right side
    918.98x = 371,809.02
  5. Step 5: Solve for x
    x = 371,809.02/918.98
  6. Step 6: Final answer
    x = 404.59

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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.