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Finding the Fourth Proportional to 778.88, 1,074.84 and 429.60

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Solution

The fourth proportional to 778.88, 1,074.84 and 429.60 is: 592.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.88 : 1,074.84 = 429.60 : x
  2. Step 2: Convert to fraction form
    778.88/1,074.84 = 429.60/x
  3. Step 3: Cross multiply
    778.88x = 1,074.84 × 429.60
  4. Step 4: Simplify right side
    778.88x = 461,751.26
  5. Step 5: Solve for x
    x = 461,751.26/778.88
  6. Step 6: Final answer
    x = 592.84

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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.