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Finding the Fourth Proportional to 1,275.18, 1,759.71 and 715.65

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Solution

The fourth proportional to 1,275.18, 1,759.71 and 715.65 is: 987.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.18 : 1,759.71 = 715.65 : x
  2. Step 2: Convert to fraction form
    1,275.18/1,759.71 = 715.65/x
  3. Step 3: Cross multiply
    1,275.18x = 1,759.71 × 715.65
  4. Step 4: Simplify right side
    1,275.18x = 1,259,336.46
  5. Step 5: Solve for x
    x = 1,259,336.46/1,275.18
  6. Step 6: Final answer
    x = 987.58

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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.