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Finding the Fourth Proportional to 1,265.95, 1,747.55 and 768.75

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Solution

The fourth proportional to 1,265.95, 1,747.55 and 768.75 is: 1,061.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.95 : 1,747.55 = 768.75 : x
  2. Step 2: Convert to fraction form
    1,265.95/1,747.55 = 768.75/x
  3. Step 3: Cross multiply
    1,265.95x = 1,747.55 × 768.75
  4. Step 4: Simplify right side
    1,265.95x = 1,343,434.56
  5. Step 5: Solve for x
    x = 1,343,434.56/1,265.95
  6. Step 6: Final answer
    x = 1,061.20

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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.