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Finding the Fourth Proportional to 1,207.81, 1,812.33 and 862.15

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Solution

The fourth proportional to 1,207.81, 1,812.33 and 862.15 is: 1,293.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.81 : 1,812.33 = 862.15 : x
  2. Step 2: Convert to fraction form
    1,207.81/1,812.33 = 862.15/x
  3. Step 3: Cross multiply
    1,207.81x = 1,812.33 × 862.15
  4. Step 4: Simplify right side
    1,207.81x = 1,562,500.31
  5. Step 5: Solve for x
    x = 1,562,500.31/1,207.81
  6. Step 6: Final answer
    x = 1,293.66

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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.