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Finding the Fourth Proportional to 779.76, 1,075.68 and 547.20

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Solution

The fourth proportional to 779.76, 1,075.68 and 547.20 is: 754.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.76 : 1,075.68 = 547.20 : x
  2. Step 2: Convert to fraction form
    779.76/1,075.68 = 547.20/x
  3. Step 3: Cross multiply
    779.76x = 1,075.68 × 547.20
  4. Step 4: Simplify right side
    779.76x = 588,612.10
  5. Step 5: Solve for x
    x = 588,612.10/779.76
  6. Step 6: Final answer
    x = 754.86

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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.