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Finding the Fourth Proportional to 647.79, 970.82 and 354.85

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Solution

The fourth proportional to 647.79, 970.82 and 354.85 is: 531.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.79 : 970.82 = 354.85 : x
  2. Step 2: Convert to fraction form
    647.79/970.82 = 354.85/x
  3. Step 3: Cross multiply
    647.79x = 970.82 × 354.85
  4. Step 4: Simplify right side
    647.79x = 344,497.58
  5. Step 5: Solve for x
    x = 344,497.58/647.79
  6. Step 6: Final answer
    x = 531.80

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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.