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Finding the Fourth Proportional to 309.72, 464.60 and 147.40

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Solution

The fourth proportional to 309.72, 464.60 and 147.40 is: 221.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.72 : 464.60 = 147.40 : x
  2. Step 2: Convert to fraction form
    309.72/464.60 = 147.40/x
  3. Step 3: Cross multiply
    309.72x = 464.60 × 147.40
  4. Step 4: Simplify right side
    309.72x = 68,482.04
  5. Step 5: Solve for x
    x = 68,482.04/309.72
  6. Step 6: Final answer
    x = 221.11

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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.