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Finding the Fourth Proportional to 260.32, 390.43 and 86.99

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Solution

The fourth proportional to 260.32, 390.43 and 86.99 is: 130.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.32 : 390.43 = 86.99 : x
  2. Step 2: Convert to fraction form
    260.32/390.43 = 86.99/x
  3. Step 3: Cross multiply
    260.32x = 390.43 × 86.99
  4. Step 4: Simplify right side
    260.32x = 33,963.51
  5. Step 5: Solve for x
    x = 33,963.51/260.32
  6. Step 6: Final answer
    x = 130.47

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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.