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Finding the Fourth Proportional to 918.61, 1,378.08 and 302.49

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Solution

The fourth proportional to 918.61, 1,378.08 and 302.49 is: 453.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.61 : 1,378.08 = 302.49 : x
  2. Step 2: Convert to fraction form
    918.61/1,378.08 = 302.49/x
  3. Step 3: Cross multiply
    918.61x = 1,378.08 × 302.49
  4. Step 4: Simplify right side
    918.61x = 416,847.02
  5. Step 5: Solve for x
    x = 416,847.02/918.61
  6. Step 6: Final answer
    x = 453.78

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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.