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Finding the Fourth Proportional to 613.47, 920.35 and 289.20

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Solution

The fourth proportional to 613.47, 920.35 and 289.20 is: 433.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.47 : 920.35 = 289.20 : x
  2. Step 2: Convert to fraction form
    613.47/920.35 = 289.20/x
  3. Step 3: Cross multiply
    613.47x = 920.35 × 289.20
  4. Step 4: Simplify right side
    613.47x = 266,167.41
  5. Step 5: Solve for x
    x = 266,167.41/613.47
  6. Step 6: Final answer
    x = 433.87

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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.