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Finding the Fourth Proportional to 314.24, 470.07 and 258.78

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Solution

The fourth proportional to 314.24, 470.07 and 258.78 is: 387.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.24 : 470.07 = 258.78 : x
  2. Step 2: Convert to fraction form
    314.24/470.07 = 258.78/x
  3. Step 3: Cross multiply
    314.24x = 470.07 × 258.78
  4. Step 4: Simplify right side
    314.24x = 121,644.71
  5. Step 5: Solve for x
    x = 121,644.71/314.24
  6. Step 6: Final answer
    x = 387.11

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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.