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Finding the Fourth Proportional to 479.18, 660.56 and 391.10

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Solution

The fourth proportional to 479.18, 660.56 and 391.10 is: 539.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.18 : 660.56 = 391.10 : x
  2. Step 2: Convert to fraction form
    479.18/660.56 = 391.10/x
  3. Step 3: Cross multiply
    479.18x = 660.56 × 391.10
  4. Step 4: Simplify right side
    479.18x = 258,339.76
  5. Step 5: Solve for x
    x = 258,339.76/479.18
  6. Step 6: Final answer
    x = 539.13

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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.