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Finding the Fourth Proportional to 779.87, 1,075.83 and 481.20

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Solution

The fourth proportional to 779.87, 1,075.83 and 481.20 is: 663.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.87 : 1,075.83 = 481.20 : x
  2. Step 2: Convert to fraction form
    779.87/1,075.83 = 481.20/x
  3. Step 3: Cross multiply
    779.87x = 1,075.83 × 481.20
  4. Step 4: Simplify right side
    779.87x = 517,689.40
  5. Step 5: Solve for x
    x = 517,689.40/779.87
  6. Step 6: Final answer
    x = 663.82

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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.