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Finding the Fourth Proportional to 1,275.51, 1,759.70 and 777.29

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Solution

The fourth proportional to 1,275.51, 1,759.70 and 777.29 is: 1,072.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.51 : 1,759.70 = 777.29 : x
  2. Step 2: Convert to fraction form
    1,275.51/1,759.70 = 777.29/x
  3. Step 3: Cross multiply
    1,275.51x = 1,759.70 × 777.29
  4. Step 4: Simplify right side
    1,275.51x = 1,367,784.53
  5. Step 5: Solve for x
    x = 1,367,784.53/1,275.51
  6. Step 6: Final answer
    x = 1,072.34

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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.