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Finding the Fourth Proportional to 478.56, 660.15 and 395.18

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Solution

The fourth proportional to 478.56, 660.15 and 395.18 is: 545.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.56 : 660.15 = 395.18 : x
  2. Step 2: Convert to fraction form
    478.56/660.15 = 395.18/x
  3. Step 3: Cross multiply
    478.56x = 660.15 × 395.18
  4. Step 4: Simplify right side
    478.56x = 260,878.08
  5. Step 5: Solve for x
    x = 260,878.08/478.56
  6. Step 6: Final answer
    x = 545.13

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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.