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Finding the Fourth Proportional to 985.43, 1,355.84 and 961.13

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Solution

The fourth proportional to 985.43, 1,355.84 and 961.13 is: 1,322.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.43 : 1,355.84 = 961.13 : x
  2. Step 2: Convert to fraction form
    985.43/1,355.84 = 961.13/x
  3. Step 3: Cross multiply
    985.43x = 1,355.84 × 961.13
  4. Step 4: Simplify right side
    985.43x = 1,303,140.69
  5. Step 5: Solve for x
    x = 1,303,140.69/985.43
  6. Step 6: Final answer
    x = 1,322.40

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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.