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Finding the Fourth Proportional to 158.91, 238.59 and 81.93

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Solution

The fourth proportional to 158.91, 238.59 and 81.93 is: 123.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.91 : 238.59 = 81.93 : x
  2. Step 2: Convert to fraction form
    158.91/238.59 = 81.93/x
  3. Step 3: Cross multiply
    158.91x = 238.59 × 81.93
  4. Step 4: Simplify right side
    158.91x = 19,547.68
  5. Step 5: Solve for x
    x = 19,547.68/158.91
  6. Step 6: Final answer
    x = 123.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.