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Finding the Fourth Proportional to 140, 210.06 and 91.88

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Solution

The fourth proportional to 140, 210.06 and 91.88 is: 137.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    140 : 210.06 = 91.88 : x
  2. Step 2: Convert to fraction form
    140/210.06 = 91.88/x
  3. Step 3: Cross multiply
    140x = 210.06 × 91.88
  4. Step 4: Simplify right side
    140x = 19,300.31
  5. Step 5: Solve for x
    x = 19,300.31/140
  6. Step 6: Final answer
    x = 137.86

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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.