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Finding the Fourth Proportional to 643.19, 964.12 and 253.03

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Solution

The fourth proportional to 643.19, 964.12 and 253.03 is: 379.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.19 : 964.12 = 253.03 : x
  2. Step 2: Convert to fraction form
    643.19/964.12 = 253.03/x
  3. Step 3: Cross multiply
    643.19x = 964.12 × 253.03
  4. Step 4: Simplify right side
    643.19x = 243,950.93
  5. Step 5: Solve for x
    x = 243,950.93/643.19
  6. Step 6: Final answer
    x = 379.28

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Double scale
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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.