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Finding the Fourth Proportional to 831.31, 1,246.95 and 215.01

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Solution

The fourth proportional to 831.31, 1,246.95 and 215.01 is: 322.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.31 : 1,246.95 = 215.01 : x
  2. Step 2: Convert to fraction form
    831.31/1,246.95 = 215.01/x
  3. Step 3: Cross multiply
    831.31x = 1,246.95 × 215.01
  4. Step 4: Simplify right side
    831.31x = 268,100.48
  5. Step 5: Solve for x
    x = 268,100.48/831.31
  6. Step 6: Final answer
    x = 322.51

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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.