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Finding the Fourth Proportional to 980.24, 1,352.88 and 607.28

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Solution

The fourth proportional to 980.24, 1,352.88 and 607.28 is: 838.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.24 : 1,352.88 = 607.28 : x
  2. Step 2: Convert to fraction form
    980.24/1,352.88 = 607.28/x
  3. Step 3: Cross multiply
    980.24x = 1,352.88 × 607.28
  4. Step 4: Simplify right side
    980.24x = 821,576.97
  5. Step 5: Solve for x
    x = 821,576.97/980.24
  6. Step 6: Final answer
    x = 838.14

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1.5x scale

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.