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Finding the Fourth Proportional to 140, 210.18 and 120.86

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Solution

The fourth proportional to 140, 210.18 and 120.86 is: 181.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    140 : 210.18 = 120.86 : x
  2. Step 2: Convert to fraction form
    140/210.18 = 120.86/x
  3. Step 3: Cross multiply
    140x = 210.18 × 120.86
  4. Step 4: Simplify right side
    140x = 25,402.35
  5. Step 5: Solve for x
    x = 25,402.35/140
  6. Step 6: Final answer
    x = 181.45

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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.