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Finding the Fourth Proportional to 901.78, 1,244.82 and 680.79

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Solution

The fourth proportional to 901.78, 1,244.82 and 680.79 is: 939.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.78 : 1,244.82 = 680.79 : x
  2. Step 2: Convert to fraction form
    901.78/1,244.82 = 680.79/x
  3. Step 3: Cross multiply
    901.78x = 1,244.82 × 680.79
  4. Step 4: Simplify right side
    901.78x = 847,461.01
  5. Step 5: Solve for x
    x = 847,461.01/901.78
  6. Step 6: Final answer
    x = 939.76

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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.