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Finding the Fourth Proportional to 401.40, 601.30 and 279.08

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Solution

The fourth proportional to 401.40, 601.30 and 279.08 is: 418.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.40 : 601.30 = 279.08 : x
  2. Step 2: Convert to fraction form
    401.40/601.30 = 279.08/x
  3. Step 3: Cross multiply
    401.40x = 601.30 × 279.08
  4. Step 4: Simplify right side
    401.40x = 167,810.80
  5. Step 5: Solve for x
    x = 167,810.80/401.40
  6. Step 6: Final answer
    x = 418.06

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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.