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Finding the Fourth Proportional to 153, 211.15 and 87.49

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Solution

The fourth proportional to 153, 211.15 and 87.49 is: 120.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    153 : 211.15 = 87.49 : x
  2. Step 2: Convert to fraction form
    153/211.15 = 87.49/x
  3. Step 3: Cross multiply
    153x = 211.15 × 87.49
  4. Step 4: Simplify right side
    153x = 18,473.51
  5. Step 5: Solve for x
    x = 18,473.51/153
  6. Step 6: Final answer
    x = 120.74

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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.