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Finding the Fourth Proportional to 643.38, 962.91 and 534.30

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Solution

The fourth proportional to 643.38, 962.91 and 534.30 is: 799.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.38 : 962.91 = 534.30 : x
  2. Step 2: Convert to fraction form
    643.38/962.91 = 534.30/x
  3. Step 3: Cross multiply
    643.38x = 962.91 × 534.30
  4. Step 4: Simplify right side
    643.38x = 514,482.81
  5. Step 5: Solve for x
    x = 514,482.81/643.38
  6. Step 6: Final answer
    x = 799.66

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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.