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Finding the Fourth Proportional to 1,407.12, 1,941.96 and 817.92

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Solution

The fourth proportional to 1,407.12, 1,941.96 and 817.92 is: 1,128.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.12 : 1,941.96 = 817.92 : x
  2. Step 2: Convert to fraction form
    1,407.12/1,941.96 = 817.92/x
  3. Step 3: Cross multiply
    1,407.12x = 1,941.96 × 817.92
  4. Step 4: Simplify right side
    1,407.12x = 1,588,367.92
  5. Step 5: Solve for x
    x = 1,588,367.92/1,407.12
  6. Step 6: Final answer
    x = 1,128.81

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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.