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Finding the Fourth Proportional to 778.61, 1,074.50 and 429.30

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Solution

The fourth proportional to 778.61, 1,074.50 and 429.30 is: 592.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.61 : 1,074.50 = 429.30 : x
  2. Step 2: Convert to fraction form
    778.61/1,074.50 = 429.30/x
  3. Step 3: Cross multiply
    778.61x = 1,074.50 × 429.30
  4. Step 4: Simplify right side
    778.61x = 461,280.70
  5. Step 5: Solve for x
    x = 461,280.70/778.61
  6. Step 6: Final answer
    x = 592.45

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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.