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Finding the Fourth Proportional to 980.60, 1,352.04 and 718.16

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Solution

The fourth proportional to 980.60, 1,352.04 and 718.16 is: 990.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.60 : 1,352.04 = 718.16 : x
  2. Step 2: Convert to fraction form
    980.60/1,352.04 = 718.16/x
  3. Step 3: Cross multiply
    980.60x = 1,352.04 × 718.16
  4. Step 4: Simplify right side
    980.60x = 970,981.05
  5. Step 5: Solve for x
    x = 970,981.05/980.60
  6. Step 6: Final answer
    x = 990.19

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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.