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Finding the Fourth Proportional to 153.12, 229.56 and 56.88

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Solution

The fourth proportional to 153.12, 229.56 and 56.88 is: 85.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.12 : 229.56 = 56.88 : x
  2. Step 2: Convert to fraction form
    153.12/229.56 = 56.88/x
  3. Step 3: Cross multiply
    153.12x = 229.56 × 56.88
  4. Step 4: Simplify right side
    153.12x = 13,057.37
  5. Step 5: Solve for x
    x = 13,057.37/153.12
  6. Step 6: Final answer
    x = 85.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.