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Finding the Fourth Proportional to 779.32, 1,075.68 and 614.28

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Solution

The fourth proportional to 779.32, 1,075.68 and 614.28 is: 847.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.32 : 1,075.68 = 614.28 : x
  2. Step 2: Convert to fraction form
    779.32/1,075.68 = 614.28/x
  3. Step 3: Cross multiply
    779.32x = 1,075.68 × 614.28
  4. Step 4: Simplify right side
    779.32x = 660,772.74
  5. Step 5: Solve for x
    x = 660,772.74/779.32
  6. Step 6: Final answer
    x = 847.88

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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.