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Finding the Fourth Proportional to 613.30, 920.38 and 288.70

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Solution

The fourth proportional to 613.30, 920.38 and 288.70 is: 433.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.30 : 920.38 = 288.70 : x
  2. Step 2: Convert to fraction form
    613.30/920.38 = 288.70/x
  3. Step 3: Cross multiply
    613.30x = 920.38 × 288.70
  4. Step 4: Simplify right side
    613.30x = 265,713.71
  5. Step 5: Solve for x
    x = 265,713.71/613.30
  6. Step 6: Final answer
    x = 433.25

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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.