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Finding the Fourth Proportional to 653.95, 980.40 and 345.73

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Solution

The fourth proportional to 653.95, 980.40 and 345.73 is: 518.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.95 : 980.40 = 345.73 : x
  2. Step 2: Convert to fraction form
    653.95/980.40 = 345.73/x
  3. Step 3: Cross multiply
    653.95x = 980.40 × 345.73
  4. Step 4: Simplify right side
    653.95x = 338,953.69
  5. Step 5: Solve for x
    x = 338,953.69/653.95
  6. Step 6: Final answer
    x = 518.32

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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.