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Finding the Fourth Proportional to 831.91, 1,247.80 and 601.21

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Solution

The fourth proportional to 831.91, 1,247.80 and 601.21 is: 901.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.91 : 1,247.80 = 601.21 : x
  2. Step 2: Convert to fraction form
    831.91/1,247.80 = 601.21/x
  3. Step 3: Cross multiply
    831.91x = 1,247.80 × 601.21
  4. Step 4: Simplify right side
    831.91x = 750,186.83
  5. Step 5: Solve for x
    x = 750,186.83/831.91
  6. Step 6: Final answer
    x = 901.77

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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.