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Finding the Fourth Proportional to 970.28, 1,336.38 and 839.24

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Solution

The fourth proportional to 970.28, 1,336.38 and 839.24 is: 1,155.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.28 : 1,336.38 = 839.24 : x
  2. Step 2: Convert to fraction form
    970.28/1,336.38 = 839.24/x
  3. Step 3: Cross multiply
    970.28x = 1,336.38 × 839.24
  4. Step 4: Simplify right side
    970.28x = 1,121,543.55
  5. Step 5: Solve for x
    x = 1,121,543.55/970.28
  6. Step 6: Final answer
    x = 1,155.90

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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.