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Finding the Fourth Proportional to 153.18, 212.88 and 151.51

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Solution

The fourth proportional to 153.18, 212.88 and 151.51 is: 210.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.18 : 212.88 = 151.51 : x
  2. Step 2: Convert to fraction form
    153.18/212.88 = 151.51/x
  3. Step 3: Cross multiply
    153.18x = 212.88 × 151.51
  4. Step 4: Simplify right side
    153.18x = 32,253.45
  5. Step 5: Solve for x
    x = 32,253.45/153.18
  6. Step 6: Final answer
    x = 210.56

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.