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Finding the Fourth Proportional to 937.02, 1,293.50 and 643.80

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Solution

The fourth proportional to 937.02, 1,293.50 and 643.80 is: 888.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.02 : 1,293.50 = 643.80 : x
  2. Step 2: Convert to fraction form
    937.02/1,293.50 = 643.80/x
  3. Step 3: Cross multiply
    937.02x = 1,293.50 × 643.80
  4. Step 4: Simplify right side
    937.02x = 832,755.30
  5. Step 5: Solve for x
    x = 832,755.30/937.02
  6. Step 6: Final answer
    x = 888.73

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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.