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Finding the Fourth Proportional to 302.05, 453.08 and 139.65

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Solution

The fourth proportional to 302.05, 453.08 and 139.65 is: 209.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.05 : 453.08 = 139.65 : x
  2. Step 2: Convert to fraction form
    302.05/453.08 = 139.65/x
  3. Step 3: Cross multiply
    302.05x = 453.08 × 139.65
  4. Step 4: Simplify right side
    302.05x = 63,272.62
  5. Step 5: Solve for x
    x = 63,272.62/302.05
  6. Step 6: Final answer
    x = 209.48

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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.