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Finding the Fourth Proportional to 498.91, 748.40 and 390.51

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Solution

The fourth proportional to 498.91, 748.40 and 390.51 is: 585.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.91 : 748.40 = 390.51 : x
  2. Step 2: Convert to fraction form
    498.91/748.40 = 390.51/x
  3. Step 3: Cross multiply
    498.91x = 748.40 × 390.51
  4. Step 4: Simplify right side
    498.91x = 292,257.68
  5. Step 5: Solve for x
    x = 292,257.68/498.91
  6. Step 6: Final answer
    x = 585.79

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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.