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Finding the Fourth Proportional to 831.22, 1,245.03 and 808.18

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Solution

The fourth proportional to 831.22, 1,245.03 and 808.18 is: 1,210.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.22 : 1,245.03 = 808.18 : x
  2. Step 2: Convert to fraction form
    831.22/1,245.03 = 808.18/x
  3. Step 3: Cross multiply
    831.22x = 1,245.03 × 808.18
  4. Step 4: Simplify right side
    831.22x = 1,006,208.35
  5. Step 5: Solve for x
    x = 1,006,208.35/831.22
  6. Step 6: Final answer
    x = 1,210.52

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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.