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Finding the Fourth Proportional to 260.04, 390.19 and 138.32

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Solution

The fourth proportional to 260.04, 390.19 and 138.32 is: 207.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.04 : 390.19 = 138.32 : x
  2. Step 2: Convert to fraction form
    260.04/390.19 = 138.32/x
  3. Step 3: Cross multiply
    260.04x = 390.19 × 138.32
  4. Step 4: Simplify right side
    260.04x = 53,971.08
  5. Step 5: Solve for x
    x = 53,971.08/260.04
  6. Step 6: Final answer
    x = 207.55

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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.