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Finding the Fourth Proportional to 154.04, 212.58 and 87.67

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Solution

The fourth proportional to 154.04, 212.58 and 87.67 is: 120.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.04 : 212.58 = 87.67 : x
  2. Step 2: Convert to fraction form
    154.04/212.58 = 87.67/x
  3. Step 3: Cross multiply
    154.04x = 212.58 × 87.67
  4. Step 4: Simplify right side
    154.04x = 18,636.47
  5. Step 5: Solve for x
    x = 18,636.47/154.04
  6. Step 6: Final answer
    x = 120.98

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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.