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Finding the Fourth Proportional to 260.47, 390.75 and 87.10

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Solution

The fourth proportional to 260.47, 390.75 and 87.10 is: 130.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.47 : 390.75 = 87.10 : x
  2. Step 2: Convert to fraction form
    260.47/390.75 = 87.10/x
  3. Step 3: Cross multiply
    260.47x = 390.75 × 87.10
  4. Step 4: Simplify right side
    260.47x = 34,033.02
  5. Step 5: Solve for x
    x = 34,033.02/260.47
  6. Step 6: Final answer
    x = 130.66

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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.