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Finding the Fourth Proportional to 936.96, 1,292.40 and 642.39

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Solution

The fourth proportional to 936.96, 1,292.40 and 642.39 is: 886.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.96 : 1,292.40 = 642.39 : x
  2. Step 2: Convert to fraction form
    936.96/1,292.40 = 642.39/x
  3. Step 3: Cross multiply
    936.96x = 1,292.40 × 642.39
  4. Step 4: Simplify right side
    936.96x = 830,224.84
  5. Step 5: Solve for x
    x = 830,224.84/936.96
  6. Step 6: Final answer
    x = 886.08

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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.