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Finding the Fourth Proportional to 936.70, 1,292.97 and 642.94

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Solution

The fourth proportional to 936.70, 1,292.97 and 642.94 is: 887.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.70 : 1,292.97 = 642.94 : x
  2. Step 2: Convert to fraction form
    936.70/1,292.97 = 642.94/x
  3. Step 3: Cross multiply
    936.70x = 1,292.97 × 642.94
  4. Step 4: Simplify right side
    936.70x = 831,302.13
  5. Step 5: Solve for x
    x = 831,302.13/936.70
  6. Step 6: Final answer
    x = 887.48

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1.5x scale

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.