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Finding the Fourth Proportional to 260.46, 390.56 and 87.07

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Solution

The fourth proportional to 260.46, 390.56 and 87.07 is: 130.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.46 : 390.56 = 87.07 : x
  2. Step 2: Convert to fraction form
    260.46/390.56 = 87.07/x
  3. Step 3: Cross multiply
    260.46x = 390.56 × 87.07
  4. Step 4: Simplify right side
    260.46x = 34,004.11
  5. Step 5: Solve for x
    x = 34,004.11/260.46
  6. Step 6: Final answer
    x = 130.55

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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.