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Finding the Fourth Proportional to 653.60, 980.56 and 491.68

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Solution

The fourth proportional to 653.60, 980.56 and 491.68 is: 737.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.60 : 980.56 = 491.68 : x
  2. Step 2: Convert to fraction form
    653.60/980.56 = 491.68/x
  3. Step 3: Cross multiply
    653.60x = 980.56 × 491.68
  4. Step 4: Simplify right side
    653.60x = 482,121.74
  5. Step 5: Solve for x
    x = 482,121.74/653.60
  6. Step 6: Final answer
    x = 737.64

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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.