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Finding the Fourth Proportional to 1,278.68, 1,764.56 and 711.51

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Solution

The fourth proportional to 1,278.68, 1,764.56 and 711.51 is: 981.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.68 : 1,764.56 = 711.51 : x
  2. Step 2: Convert to fraction form
    1,278.68/1,764.56 = 711.51/x
  3. Step 3: Cross multiply
    1,278.68x = 1,764.56 × 711.51
  4. Step 4: Simplify right side
    1,278.68x = 1,255,497.21
  5. Step 5: Solve for x
    x = 1,255,497.21/1,278.68
  6. Step 6: Final answer
    x = 981.87

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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.