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Finding the Fourth Proportional to 279.99, 420.07 and 97.54

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Solution

The fourth proportional to 279.99, 420.07 and 97.54 is: 146.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.99 : 420.07 = 97.54 : x
  2. Step 2: Convert to fraction form
    279.99/420.07 = 97.54/x
  3. Step 3: Cross multiply
    279.99x = 420.07 × 97.54
  4. Step 4: Simplify right side
    279.99x = 40,973.63
  5. Step 5: Solve for x
    x = 40,973.63/279.99
  6. Step 6: Final answer
    x = 146.34

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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.