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Finding the Fourth Proportional to 778.90, 1,075.07 and 484.39

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Solution

The fourth proportional to 778.90, 1,075.07 and 484.39 is: 668.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.90 : 1,075.07 = 484.39 : x
  2. Step 2: Convert to fraction form
    778.90/1,075.07 = 484.39/x
  3. Step 3: Cross multiply
    778.90x = 1,075.07 × 484.39
  4. Step 4: Simplify right side
    778.90x = 520,753.16
  5. Step 5: Solve for x
    x = 520,753.16/778.90
  6. Step 6: Final answer
    x = 668.58

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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.