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Finding the Fourth Proportional to 1,237.12, 1,707.39 and 812.11

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Solution

The fourth proportional to 1,237.12, 1,707.39 and 812.11 is: 1,120.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,237.12 : 1,707.39 = 812.11 : x
  2. Step 2: Convert to fraction form
    1,237.12/1,707.39 = 812.11/x
  3. Step 3: Cross multiply
    1,237.12x = 1,707.39 × 812.11
  4. Step 4: Simplify right side
    1,237.12x = 1,386,584.43
  5. Step 5: Solve for x
    x = 1,386,584.43/1,237.12
  6. Step 6: Final answer
    x = 1,120.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.