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Finding the Fourth Proportional to 778.89, 1,074.89 and 517.38

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Solution

The fourth proportional to 778.89, 1,074.89 and 517.38 is: 714.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.89 : 1,074.89 = 517.38 : x
  2. Step 2: Convert to fraction form
    778.89/1,074.89 = 517.38/x
  3. Step 3: Cross multiply
    778.89x = 1,074.89 × 517.38
  4. Step 4: Simplify right side
    778.89x = 556,124.00
  5. Step 5: Solve for x
    x = 556,124.00/778.89
  6. Step 6: Final answer
    x = 714.00

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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.