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Finding the Fourth Proportional to 947.18, 1,417.25 and 831.08

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Solution

The fourth proportional to 947.18, 1,417.25 and 831.08 is: 1,243.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.18 : 1,417.25 = 831.08 : x
  2. Step 2: Convert to fraction form
    947.18/1,417.25 = 831.08/x
  3. Step 3: Cross multiply
    947.18x = 1,417.25 × 831.08
  4. Step 4: Simplify right side
    947.18x = 1,177,836.89
  5. Step 5: Solve for x
    x = 1,177,836.89/947.18
  6. Step 6: Final answer
    x = 1,243.53

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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.