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Finding the Fourth Proportional to 613.98, 921.12 and 288.98

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Solution

The fourth proportional to 613.98, 921.12 and 288.98 is: 433.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.98 : 921.12 = 288.98 : x
  2. Step 2: Convert to fraction form
    613.98/921.12 = 288.98/x
  3. Step 3: Cross multiply
    613.98x = 921.12 × 288.98
  4. Step 4: Simplify right side
    613.98x = 266,185.26
  5. Step 5: Solve for x
    x = 266,185.26/613.98
  6. Step 6: Final answer
    x = 433.54

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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.