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Finding the Fourth Proportional to 980.48, 1,353.17 and 626.72

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Solution

The fourth proportional to 980.48, 1,353.17 and 626.72 is: 864.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.48 : 1,353.17 = 626.72 : x
  2. Step 2: Convert to fraction form
    980.48/1,353.17 = 626.72/x
  3. Step 3: Cross multiply
    980.48x = 1,353.17 × 626.72
  4. Step 4: Simplify right side
    980.48x = 848,064.18
  5. Step 5: Solve for x
    x = 848,064.18/980.48
  6. Step 6: Final answer
    x = 864.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.