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Finding the Fourth Proportional to 1,352.15, 1,863.78 and 979.15

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Solution

The fourth proportional to 1,352.15, 1,863.78 and 979.15 is: 1,349.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,352.15 : 1,863.78 = 979.15 : x
  2. Step 2: Convert to fraction form
    1,352.15/1,863.78 = 979.15/x
  3. Step 3: Cross multiply
    1,352.15x = 1,863.78 × 979.15
  4. Step 4: Simplify right side
    1,352.15x = 1,824,920.19
  5. Step 5: Solve for x
    x = 1,824,920.19/1,352.15
  6. Step 6: Final answer
    x = 1,349.64

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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.