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Finding the Fourth Proportional to 153, 211.20 and 90.89

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Solution

The fourth proportional to 153, 211.20 and 90.89 is: 125.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    153 : 211.20 = 90.89 : x
  2. Step 2: Convert to fraction form
    153/211.20 = 90.89/x
  3. Step 3: Cross multiply
    153x = 211.20 × 90.89
  4. Step 4: Simplify right side
    153x = 19,194.91
  5. Step 5: Solve for x
    x = 19,194.91/153
  6. Step 6: Final answer
    x = 125.46

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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.