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Finding the Fourth Proportional to 653.85, 980.79 and 615.81

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Solution

The fourth proportional to 653.85, 980.79 and 615.81 is: 923.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.85 : 980.79 = 615.81 : x
  2. Step 2: Convert to fraction form
    653.85/980.79 = 615.81/x
  3. Step 3: Cross multiply
    653.85x = 980.79 × 615.81
  4. Step 4: Simplify right side
    653.85x = 603,980.29
  5. Step 5: Solve for x
    x = 603,980.29/653.85
  6. Step 6: Final answer
    x = 923.73

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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.