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Finding the Fourth Proportional to 1,275.42, 1,759.78 and 777.88

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Solution

The fourth proportional to 1,275.42, 1,759.78 and 777.88 is: 1,073.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.42 : 1,759.78 = 777.88 : x
  2. Step 2: Convert to fraction form
    1,275.42/1,759.78 = 777.88/x
  3. Step 3: Cross multiply
    1,275.42x = 1,759.78 × 777.88
  4. Step 4: Simplify right side
    1,275.42x = 1,368,891.51
  5. Step 5: Solve for x
    x = 1,368,891.51/1,275.42
  6. Step 6: Final answer
    x = 1,073.29

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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.