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Finding the Fourth Proportional to 831.05, 1,246.56 and 214.75

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Solution

The fourth proportional to 831.05, 1,246.56 and 214.75 is: 322.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.05 : 1,246.56 = 214.75 : x
  2. Step 2: Convert to fraction form
    831.05/1,246.56 = 214.75/x
  3. Step 3: Cross multiply
    831.05x = 1,246.56 × 214.75
  4. Step 4: Simplify right side
    831.05x = 267,701.32
  5. Step 5: Solve for x
    x = 267,701.32/831.05
  6. Step 6: Final answer
    x = 322.12

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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.