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Finding the Fourth Proportional to 647.20, 970.78 and 262.44

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Solution

The fourth proportional to 647.20, 970.78 and 262.44 is: 393.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.20 : 970.78 = 262.44 : x
  2. Step 2: Convert to fraction form
    647.20/970.78 = 262.44/x
  3. Step 3: Cross multiply
    647.20x = 970.78 × 262.44
  4. Step 4: Simplify right side
    647.20x = 254,771.50
  5. Step 5: Solve for x
    x = 254,771.50/647.20
  6. Step 6: Final answer
    x = 393.65

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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.