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Finding the Fourth Proportional to 153.65, 211.90 and 103.87

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Solution

The fourth proportional to 153.65, 211.90 and 103.87 is: 143.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.65 : 211.90 = 103.87 : x
  2. Step 2: Convert to fraction form
    153.65/211.90 = 103.87/x
  3. Step 3: Cross multiply
    153.65x = 211.90 × 103.87
  4. Step 4: Simplify right side
    153.65x = 22,010.05
  5. Step 5: Solve for x
    x = 22,010.05/153.65
  6. Step 6: Final answer
    x = 143.25

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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.