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Finding the Fourth Proportional to 1,287.55, 1,928.73 and 1,221.13

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Solution

The fourth proportional to 1,287.55, 1,928.73 and 1,221.13 is: 1,829.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.55 : 1,928.73 = 1,221.13 : x
  2. Step 2: Convert to fraction form
    1,287.55/1,928.73 = 1,221.13/x
  3. Step 3: Cross multiply
    1,287.55x = 1,928.73 × 1,221.13
  4. Step 4: Simplify right side
    1,287.55x = 2,355,230.06
  5. Step 5: Solve for x
    x = 2,355,230.06/1,287.55
  6. Step 6: Final answer
    x = 1,829.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.