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Finding the Fourth Proportional to 647.25, 970.90 and 208.52

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Solution

The fourth proportional to 647.25, 970.90 and 208.52 is: 312.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.25 : 970.90 = 208.52 : x
  2. Step 2: Convert to fraction form
    647.25/970.90 = 208.52/x
  3. Step 3: Cross multiply
    647.25x = 970.90 × 208.52
  4. Step 4: Simplify right side
    647.25x = 202,451.03
  5. Step 5: Solve for x
    x = 202,451.03/647.25
  6. Step 6: Final answer
    x = 312.79

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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.