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Finding the Fourth Proportional to 153.95, 212.45 and 88.47

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Solution

The fourth proportional to 153.95, 212.45 and 88.47 is: 122.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.95 : 212.45 = 88.47 : x
  2. Step 2: Convert to fraction form
    153.95/212.45 = 88.47/x
  3. Step 3: Cross multiply
    153.95x = 212.45 × 88.47
  4. Step 4: Simplify right side
    153.95x = 18,795.01
  5. Step 5: Solve for x
    x = 18,795.01/153.95
  6. Step 6: Final answer
    x = 122.09

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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.