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Finding the Fourth Proportional to 831.46, 1,246.38 and 739.66

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Solution

The fourth proportional to 831.46, 1,246.38 and 739.66 is: 1,108.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.46 : 1,246.38 = 739.66 : x
  2. Step 2: Convert to fraction form
    831.46/1,246.38 = 739.66/x
  3. Step 3: Cross multiply
    831.46x = 1,246.38 × 739.66
  4. Step 4: Simplify right side
    831.46x = 921,897.43
  5. Step 5: Solve for x
    x = 921,897.43/831.46
  6. Step 6: Final answer
    x = 1,108.77

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1.5x scale

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.