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Finding the Fourth Proportional to 279.58, 419.46 and 135.30

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Solution

The fourth proportional to 279.58, 419.46 and 135.30 is: 202.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.58 : 419.46 = 135.30 : x
  2. Step 2: Convert to fraction form
    279.58/419.46 = 135.30/x
  3. Step 3: Cross multiply
    279.58x = 419.46 × 135.30
  4. Step 4: Simplify right side
    279.58x = 56,752.94
  5. Step 5: Solve for x
    x = 56,752.94/279.58
  6. Step 6: Final answer
    x = 202.99

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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.