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Finding the Fourth Proportional to 1,275.24, 1,759.86 and 715.75

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Solution

The fourth proportional to 1,275.24, 1,759.86 and 715.75 is: 987.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.24 : 1,759.86 = 715.75 : x
  2. Step 2: Convert to fraction form
    1,275.24/1,759.86 = 715.75/x
  3. Step 3: Cross multiply
    1,275.24x = 1,759.86 × 715.75
  4. Step 4: Simplify right side
    1,275.24x = 1,259,619.80
  5. Step 5: Solve for x
    x = 1,259,619.80/1,275.24
  6. Step 6: Final answer
    x = 987.75

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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.