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Finding the Fourth Proportional to 626.76, 864.86 and 390.65

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Solution

The fourth proportional to 626.76, 864.86 and 390.65 is: 539.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.76 : 864.86 = 390.65 : x
  2. Step 2: Convert to fraction form
    626.76/864.86 = 390.65/x
  3. Step 3: Cross multiply
    626.76x = 864.86 × 390.65
  4. Step 4: Simplify right side
    626.76x = 337,851.28
  5. Step 5: Solve for x
    x = 337,851.28/626.76
  6. Step 6: Final answer
    x = 539.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.