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Finding the Fourth Proportional to 902.78, 1,245.66 and 570.97

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Solution

The fourth proportional to 902.78, 1,245.66 and 570.97 is: 787.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.78 : 1,245.66 = 570.97 : x
  2. Step 2: Convert to fraction form
    902.78/1,245.66 = 570.97/x
  3. Step 3: Cross multiply
    902.78x = 1,245.66 × 570.97
  4. Step 4: Simplify right side
    902.78x = 711,234.49
  5. Step 5: Solve for x
    x = 711,234.49/902.78
  6. Step 6: Final answer
    x = 787.83

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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.