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Finding the Fourth Proportional to 317.76, 478.52 and 277.66

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Solution

The fourth proportional to 317.76, 478.52 and 277.66 is: 418.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.76 : 478.52 = 277.66 : x
  2. Step 2: Convert to fraction form
    317.76/478.52 = 277.66/x
  3. Step 3: Cross multiply
    317.76x = 478.52 × 277.66
  4. Step 4: Simplify right side
    317.76x = 132,865.86
  5. Step 5: Solve for x
    x = 132,865.86/317.76
  6. Step 6: Final answer
    x = 418.13

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.