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Finding the Fourth Proportional to 653.80, 980.70 and 613.30

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Solution

The fourth proportional to 653.80, 980.70 and 613.30 is: 919.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.80 : 980.70 = 613.30 : x
  2. Step 2: Convert to fraction form
    653.80/980.70 = 613.30/x
  3. Step 3: Cross multiply
    653.80x = 980.70 × 613.30
  4. Step 4: Simplify right side
    653.80x = 601,463.31
  5. Step 5: Solve for x
    x = 601,463.31/653.80
  6. Step 6: Final answer
    x = 919.95

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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.