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Finding the Fourth Proportional to 936.96, 1,292.40 and 905.28

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Solution

The fourth proportional to 936.96, 1,292.40 and 905.28 is: 1,248.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.96 : 1,292.40 = 905.28 : x
  2. Step 2: Convert to fraction form
    936.96/1,292.40 = 905.28/x
  3. Step 3: Cross multiply
    936.96x = 1,292.40 × 905.28
  4. Step 4: Simplify right side
    936.96x = 1,169,983.87
  5. Step 5: Solve for x
    x = 1,169,983.87/936.96
  6. Step 6: Final answer
    x = 1,248.70

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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.