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Finding the Fourth Proportional to 980.79, 1,353.32 and 607.47

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Solution

The fourth proportional to 980.79, 1,353.32 and 607.47 is: 838.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.79 : 1,353.32 = 607.47 : x
  2. Step 2: Convert to fraction form
    980.79/1,353.32 = 607.47/x
  3. Step 3: Cross multiply
    980.79x = 1,353.32 × 607.47
  4. Step 4: Simplify right side
    980.79x = 822,098.26
  5. Step 5: Solve for x
    x = 822,098.26/980.79
  6. Step 6: Final answer
    x = 838.20

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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.