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Finding the Fourth Proportional to 969.39, 1,335.96 and 720.32

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Solution

The fourth proportional to 969.39, 1,335.96 and 720.32 is: 992.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.39 : 1,335.96 = 720.32 : x
  2. Step 2: Convert to fraction form
    969.39/1,335.96 = 720.32/x
  3. Step 3: Cross multiply
    969.39x = 1,335.96 × 720.32
  4. Step 4: Simplify right side
    969.39x = 962,312.03
  5. Step 5: Solve for x
    x = 962,312.03/969.39
  6. Step 6: Final answer
    x = 992.70

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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.