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Finding the Fourth Proportional to 1,353.92, 1,865.62 and 1,039.19

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Solution

The fourth proportional to 1,353.92, 1,865.62 and 1,039.19 is: 1,431.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353.92 : 1,865.62 = 1,039.19 : x
  2. Step 2: Convert to fraction form
    1,353.92/1,865.62 = 1,039.19/x
  3. Step 3: Cross multiply
    1,353.92x = 1,865.62 × 1,039.19
  4. Step 4: Simplify right side
    1,353.92x = 1,938,733.65
  5. Step 5: Solve for x
    x = 1,938,733.65/1,353.92
  6. Step 6: Final answer
    x = 1,431.94

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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.