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Finding the Fourth Proportional to 653.58, 980.55 and 345.78

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Solution

The fourth proportional to 653.58, 980.55 and 345.78 is: 518.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.58 : 980.55 = 345.78 : x
  2. Step 2: Convert to fraction form
    653.58/980.55 = 345.78/x
  3. Step 3: Cross multiply
    653.58x = 980.55 × 345.78
  4. Step 4: Simplify right side
    653.58x = 339,054.58
  5. Step 5: Solve for x
    x = 339,054.58/653.58
  6. Step 6: Final answer
    x = 518.77

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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.