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Finding the Fourth Proportional to 260.61, 390.76 and 98.11

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Solution

The fourth proportional to 260.61, 390.76 and 98.11 is: 147.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.61 : 390.76 = 98.11 : x
  2. Step 2: Convert to fraction form
    260.61/390.76 = 98.11/x
  3. Step 3: Cross multiply
    260.61x = 390.76 × 98.11
  4. Step 4: Simplify right side
    260.61x = 38,336.24
  5. Step 5: Solve for x
    x = 38,336.24/260.61
  6. Step 6: Final answer
    x = 147.10

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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.