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Finding the Fourth Proportional to 647.45, 970.87 and 208.62

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Solution

The fourth proportional to 647.45, 970.87 and 208.62 is: 312.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.45 : 970.87 = 208.62 : x
  2. Step 2: Convert to fraction form
    647.45/970.87 = 208.62/x
  3. Step 3: Cross multiply
    647.45x = 970.87 × 208.62
  4. Step 4: Simplify right side
    647.45x = 202,537.52
  5. Step 5: Solve for x
    x = 202,537.52/647.45
  6. Step 6: Final answer
    x = 312.83

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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.