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Finding the Fourth Proportional to 937.28, 1,292.70 and 642.08

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Solution

The fourth proportional to 937.28, 1,292.70 and 642.08 is: 885.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.28 : 1,292.70 = 642.08 : x
  2. Step 2: Convert to fraction form
    937.28/1,292.70 = 642.08/x
  3. Step 3: Cross multiply
    937.28x = 1,292.70 × 642.08
  4. Step 4: Simplify right side
    937.28x = 830,016.82
  5. Step 5: Solve for x
    x = 830,016.82/937.28
  6. Step 6: Final answer
    x = 885.56

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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.