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Finding the Fourth Proportional to 268.39, 370.31 and 156.36

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Solution

The fourth proportional to 268.39, 370.31 and 156.36 is: 215.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.39 : 370.31 = 156.36 : x
  2. Step 2: Convert to fraction form
    268.39/370.31 = 156.36/x
  3. Step 3: Cross multiply
    268.39x = 370.31 × 156.36
  4. Step 4: Simplify right side
    268.39x = 57,901.67
  5. Step 5: Solve for x
    x = 57,901.67/268.39
  6. Step 6: Final answer
    x = 215.74

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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.