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Finding the Fourth Proportional to 209.19, 312.55 and 202.02

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Solution

The fourth proportional to 209.19, 312.55 and 202.02 is: 301.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.19 : 312.55 = 202.02 : x
  2. Step 2: Convert to fraction form
    209.19/312.55 = 202.02/x
  3. Step 3: Cross multiply
    209.19x = 312.55 × 202.02
  4. Step 4: Simplify right side
    209.19x = 63,140.81
  5. Step 5: Solve for x
    x = 63,140.81/209.19
  6. Step 6: Final answer
    x = 301.83

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.