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Finding the Fourth Proportional to 319.14, 478.17 and 210.87

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Solution

The fourth proportional to 319.14, 478.17 and 210.87 is: 315.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.14 : 478.17 = 210.87 : x
  2. Step 2: Convert to fraction form
    319.14/478.17 = 210.87/x
  3. Step 3: Cross multiply
    319.14x = 478.17 × 210.87
  4. Step 4: Simplify right side
    319.14x = 100,831.71
  5. Step 5: Solve for x
    x = 100,831.71/319.14
  6. Step 6: Final answer
    x = 315.95

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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.