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Finding the Fourth Proportional to 653.56, 980.40 and 328.92

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Solution

The fourth proportional to 653.56, 980.40 and 328.92 is: 493.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.56 : 980.40 = 328.92 : x
  2. Step 2: Convert to fraction form
    653.56/980.40 = 328.92/x
  3. Step 3: Cross multiply
    653.56x = 980.40 × 328.92
  4. Step 4: Simplify right side
    653.56x = 322,473.17
  5. Step 5: Solve for x
    x = 322,473.17/653.56
  6. Step 6: Final answer
    x = 493.41

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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.