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Finding the Fourth Proportional to 778.96, 1,074.96 and 429.68

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Solution

The fourth proportional to 778.96, 1,074.96 and 429.68 is: 592.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.96 : 1,074.96 = 429.68 : x
  2. Step 2: Convert to fraction form
    778.96/1,074.96 = 429.68/x
  3. Step 3: Cross multiply
    778.96x = 1,074.96 × 429.68
  4. Step 4: Simplify right side
    778.96x = 461,888.81
  5. Step 5: Solve for x
    x = 461,888.81/778.96
  6. Step 6: Final answer
    x = 592.96

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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.