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Finding the Fourth Proportional to 1,278.47, 1,764.26 and 711.30

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Solution

The fourth proportional to 1,278.47, 1,764.26 and 711.30 is: 981.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.47 : 1,764.26 = 711.30 : x
  2. Step 2: Convert to fraction form
    1,278.47/1,764.26 = 711.30/x
  3. Step 3: Cross multiply
    1,278.47x = 1,764.26 × 711.30
  4. Step 4: Simplify right side
    1,278.47x = 1,254,912.98
  5. Step 5: Solve for x
    x = 1,254,912.98/1,278.47
  6. Step 6: Final answer
    x = 981.58

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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.