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Finding the Fourth Proportional to 155.39, 216.15 and 152.42

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Solution

The fourth proportional to 155.39, 216.15 and 152.42 is: 212.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.39 : 216.15 = 152.42 : x
  2. Step 2: Convert to fraction form
    155.39/216.15 = 152.42/x
  3. Step 3: Cross multiply
    155.39x = 216.15 × 152.42
  4. Step 4: Simplify right side
    155.39x = 32,943.93
  5. Step 5: Solve for x
    x = 32,943.93/155.39
  6. Step 6: Final answer
    x = 212.01

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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.