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Finding the Fourth Proportional to 260.34, 390.53 and 87.09

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Solution

The fourth proportional to 260.34, 390.53 and 87.09 is: 130.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.34 : 390.53 = 87.09 : x
  2. Step 2: Convert to fraction form
    260.34/390.53 = 87.09/x
  3. Step 3: Cross multiply
    260.34x = 390.53 × 87.09
  4. Step 4: Simplify right side
    260.34x = 34,010.82
  5. Step 5: Solve for x
    x = 34,010.82/260.34
  6. Step 6: Final answer
    x = 130.64

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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.