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Finding the Fourth Proportional to 653.77, 980.78 and 191.56

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Solution

The fourth proportional to 653.77, 980.78 and 191.56 is: 287.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.77 : 980.78 = 191.56 : x
  2. Step 2: Convert to fraction form
    653.77/980.78 = 191.56/x
  3. Step 3: Cross multiply
    653.77x = 980.78 × 191.56
  4. Step 4: Simplify right side
    653.77x = 187,875.50
  5. Step 5: Solve for x
    x = 187,875.50/653.77
  6. Step 6: Final answer
    x = 287.37

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1.5x scale

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.