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Finding the Fourth Proportional to 153.85, 212.34 and 88.40

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Solution

The fourth proportional to 153.85, 212.34 and 88.40 is: 122.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.85 : 212.34 = 88.40 : x
  2. Step 2: Convert to fraction form
    153.85/212.34 = 88.40/x
  3. Step 3: Cross multiply
    153.85x = 212.34 × 88.40
  4. Step 4: Simplify right side
    153.85x = 18,769.35
  5. Step 5: Solve for x
    x = 18,769.35/153.85
  6. Step 6: Final answer
    x = 122.00

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.