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Finding the Fourth Proportional to 653.55, 980.94 and 638.57

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Solution

The fourth proportional to 653.55, 980.94 and 638.57 is: 958.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.55 : 980.94 = 638.57 : x
  2. Step 2: Convert to fraction form
    653.55/980.94 = 638.57/x
  3. Step 3: Cross multiply
    653.55x = 980.94 × 638.57
  4. Step 4: Simplify right side
    653.55x = 626,393.95
  5. Step 5: Solve for x
    x = 626,393.95/653.55
  6. Step 6: Final answer
    x = 958.45

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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.