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Finding the Fourth Proportional to 425.47, 636.91 and 260.50

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Solution

The fourth proportional to 425.47, 636.91 and 260.50 is: 389.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.47 : 636.91 = 260.50 : x
  2. Step 2: Convert to fraction form
    425.47/636.91 = 260.50/x
  3. Step 3: Cross multiply
    425.47x = 636.91 × 260.50
  4. Step 4: Simplify right side
    425.47x = 165,915.06
  5. Step 5: Solve for x
    x = 165,915.06/425.47
  6. Step 6: Final answer
    x = 389.96

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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.