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Finding the Fourth Proportional to 779.68, 1,074.40 and 614.56

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Solution

The fourth proportional to 779.68, 1,074.40 and 614.56 is: 846.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.68 : 1,074.40 = 614.56 : x
  2. Step 2: Convert to fraction form
    779.68/1,074.40 = 614.56/x
  3. Step 3: Cross multiply
    779.68x = 1,074.40 × 614.56
  4. Step 4: Simplify right side
    779.68x = 660,283.26
  5. Step 5: Solve for x
    x = 660,283.26/779.68
  6. Step 6: Final answer
    x = 846.86

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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.