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Finding the Fourth Proportional to 1,278.55, 1,764.48 and 711.42

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Solution

The fourth proportional to 1,278.55, 1,764.48 and 711.42 is: 981.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.55 : 1,764.48 = 711.42 : x
  2. Step 2: Convert to fraction form
    1,278.55/1,764.48 = 711.42/x
  3. Step 3: Cross multiply
    1,278.55x = 1,764.48 × 711.42
  4. Step 4: Simplify right side
    1,278.55x = 1,255,286.36
  5. Step 5: Solve for x
    x = 1,255,286.36/1,278.55
  6. Step 6: Final answer
    x = 981.80

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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.