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Finding the Fourth Proportional to 937.66, 1,294.50 and 643.36

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Solution

The fourth proportional to 937.66, 1,294.50 and 643.36 is: 888.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.66 : 1,294.50 = 643.36 : x
  2. Step 2: Convert to fraction form
    937.66/1,294.50 = 643.36/x
  3. Step 3: Cross multiply
    937.66x = 1,294.50 × 643.36
  4. Step 4: Simplify right side
    937.66x = 832,829.52
  5. Step 5: Solve for x
    x = 832,829.52/937.66
  6. Step 6: Final answer
    x = 888.20

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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.