Home / 1,313.28-1,979.88-1,242.72

Finding the Fourth Proportional to 1,313.28, 1,979.88 and 1,242.72

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Solution

The fourth proportional to 1,313.28, 1,979.88 and 1,242.72 is: 1,873.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.28 : 1,979.88 = 1,242.72 : x
  2. Step 2: Convert to fraction form
    1,313.28/1,979.88 = 1,242.72/x
  3. Step 3: Cross multiply
    1,313.28x = 1,979.88 × 1,242.72
  4. Step 4: Simplify right side
    1,313.28x = 2,460,436.47
  5. Step 5: Solve for x
    x = 2,460,436.47/1,313.28
  6. Step 6: Final answer
    x = 1,873.50

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.