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Finding the Fourth Proportional to 937.12, 1,292.97 and 642.46

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Solution

The fourth proportional to 937.12, 1,292.97 and 642.46 is: 886.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.12 : 1,292.97 = 642.46 : x
  2. Step 2: Convert to fraction form
    937.12/1,292.97 = 642.46/x
  3. Step 3: Cross multiply
    937.12x = 1,292.97 × 642.46
  4. Step 4: Simplify right side
    937.12x = 830,681.51
  5. Step 5: Solve for x
    x = 830,681.51/937.12
  6. Step 6: Final answer
    x = 886.42

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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.