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Finding the Fourth Proportional to 643.17, 964.76 and 210.33

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Solution

The fourth proportional to 643.17, 964.76 and 210.33 is: 315.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.17 : 964.76 = 210.33 : x
  2. Step 2: Convert to fraction form
    643.17/964.76 = 210.33/x
  3. Step 3: Cross multiply
    643.17x = 964.76 × 210.33
  4. Step 4: Simplify right side
    643.17x = 202,917.97
  5. Step 5: Solve for x
    x = 202,917.97/643.17
  6. Step 6: Final answer
    x = 315.50

Related Problems

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Half scale
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Double scale
Find fourth proportional to 644.17, 966.26 and 211.33
Similar ratio
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1.5x scale

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.