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Finding the Fourth Proportional to 1,222.85, 1,831.18 and 810.74

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Solution

The fourth proportional to 1,222.85, 1,831.18 and 810.74 is: 1,214.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.85 : 1,831.18 = 810.74 : x
  2. Step 2: Convert to fraction form
    1,222.85/1,831.18 = 810.74/x
  3. Step 3: Cross multiply
    1,222.85x = 1,831.18 × 810.74
  4. Step 4: Simplify right side
    1,222.85x = 1,484,610.87
  5. Step 5: Solve for x
    x = 1,484,610.87/1,222.85
  6. Step 6: Final answer
    x = 1,214.06

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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.