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Finding the Fourth Proportional to 1,407.11, 1,942.20 and 817.53

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Solution

The fourth proportional to 1,407.11, 1,942.20 and 817.53 is: 1,128.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.11 : 1,942.20 = 817.53 : x
  2. Step 2: Convert to fraction form
    1,407.11/1,942.20 = 817.53/x
  3. Step 3: Cross multiply
    1,407.11x = 1,942.20 × 817.53
  4. Step 4: Simplify right side
    1,407.11x = 1,587,806.77
  5. Step 5: Solve for x
    x = 1,587,806.77/1,407.11
  6. Step 6: Final answer
    x = 1,128.42

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1.5x scale

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.