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Finding the Fourth Proportional to 420, 579.50 and 242.91

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Solution

The fourth proportional to 420, 579.50 and 242.91 is: 335.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    420 : 579.50 = 242.91 : x
  2. Step 2: Convert to fraction form
    420/579.50 = 242.91/x
  3. Step 3: Cross multiply
    420x = 579.50 × 242.91
  4. Step 4: Simplify right side
    420x = 140,765.13
  5. Step 5: Solve for x
    x = 140,765.13/420
  6. Step 6: Final answer
    x = 335.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.