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Finding the Fourth Proportional to 613.55, 918.70 and 448.92

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Solution

The fourth proportional to 613.55, 918.70 and 448.92 is: 672.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.55 : 918.70 = 448.92 : x
  2. Step 2: Convert to fraction form
    613.55/918.70 = 448.92/x
  3. Step 3: Cross multiply
    613.55x = 918.70 × 448.92
  4. Step 4: Simplify right side
    613.55x = 412,422.80
  5. Step 5: Solve for x
    x = 412,422.80/613.55
  6. Step 6: Final answer
    x = 672.19

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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.