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Finding the Fourth Proportional to 643.52, 964.86 and 355.16

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Solution

The fourth proportional to 643.52, 964.86 and 355.16 is: 532.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.52 : 964.86 = 355.16 : x
  2. Step 2: Convert to fraction form
    643.52/964.86 = 355.16/x
  3. Step 3: Cross multiply
    643.52x = 964.86 × 355.16
  4. Step 4: Simplify right side
    643.52x = 342,674.85
  5. Step 5: Solve for x
    x = 342,674.85/643.52
  6. Step 6: Final answer
    x = 532.50

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Double scale
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Similar ratio
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.