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Finding the Fourth Proportional to 1,353.92, 1,868.13 and 1,039.55

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Solution

The fourth proportional to 1,353.92, 1,868.13 and 1,039.55 is: 1,434.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353.92 : 1,868.13 = 1,039.55 : x
  2. Step 2: Convert to fraction form
    1,353.92/1,868.13 = 1,039.55/x
  3. Step 3: Cross multiply
    1,353.92x = 1,868.13 × 1,039.55
  4. Step 4: Simplify right side
    1,353.92x = 1,942,005.20
  5. Step 5: Solve for x
    x = 1,942,005.20/1,353.92
  6. Step 6: Final answer
    x = 1,434.36

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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.