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Finding the Fourth Proportional to 964.78, 1,331.49 and 616.18

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Solution

The fourth proportional to 964.78, 1,331.49 and 616.18 is: 850.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.78 : 1,331.49 = 616.18 : x
  2. Step 2: Convert to fraction form
    964.78/1,331.49 = 616.18/x
  3. Step 3: Cross multiply
    964.78x = 1,331.49 × 616.18
  4. Step 4: Simplify right side
    964.78x = 820,437.51
  5. Step 5: Solve for x
    x = 820,437.51/964.78
  6. Step 6: Final answer
    x = 850.39

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Double scale
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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.