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Finding the Fourth Proportional to 302.31, 453.56 and 139.90

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Solution

The fourth proportional to 302.31, 453.56 and 139.90 is: 209.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.31 : 453.56 = 139.90 : x
  2. Step 2: Convert to fraction form
    302.31/453.56 = 139.90/x
  3. Step 3: Cross multiply
    302.31x = 453.56 × 139.90
  4. Step 4: Simplify right side
    302.31x = 63,453.04
  5. Step 5: Solve for x
    x = 63,453.04/302.31
  6. Step 6: Final answer
    x = 209.89

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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.