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Finding the Fourth Proportional to 279.96, 420 and 97.40

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Solution

The fourth proportional to 279.96, 420 and 97.40 is: 146.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.96 : 420 = 97.40 : x
  2. Step 2: Convert to fraction form
    279.96/420 = 97.40/x
  3. Step 3: Cross multiply
    279.96x = 420 × 97.40
  4. Step 4: Simplify right side
    279.96x = 40,908
  5. Step 5: Solve for x
    x = 40,908/279.96
  6. Step 6: Final answer
    x = 146.12

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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.