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Finding the Fourth Proportional to 1,315.14, 1,815.62 and 960.71

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Solution

The fourth proportional to 1,315.14, 1,815.62 and 960.71 is: 1,326.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.14 : 1,815.62 = 960.71 : x
  2. Step 2: Convert to fraction form
    1,315.14/1,815.62 = 960.71/x
  3. Step 3: Cross multiply
    1,315.14x = 1,815.62 × 960.71
  4. Step 4: Simplify right side
    1,315.14x = 1,744,284.29
  5. Step 5: Solve for x
    x = 1,744,284.29/1,315.14
  6. Step 6: Final answer
    x = 1,326.31

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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.