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Finding the Fourth Proportional to 653.68, 980.70 and 397

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Solution

The fourth proportional to 653.68, 980.70 and 397 is: 595.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.68 : 980.70 = 397 : x
  2. Step 2: Convert to fraction form
    653.68/980.70 = 397/x
  3. Step 3: Cross multiply
    653.68x = 980.70 × 397
  4. Step 4: Simplify right side
    653.68x = 389,337.90
  5. Step 5: Solve for x
    x = 389,337.90/653.68
  6. Step 6: Final answer
    x = 595.61

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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.