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Finding the Fourth Proportional to 1,292.25, 1,783.86 and 873.18

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Solution

The fourth proportional to 1,292.25, 1,783.86 and 873.18 is: 1,205.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.25 : 1,783.86 = 873.18 : x
  2. Step 2: Convert to fraction form
    1,292.25/1,783.86 = 873.18/x
  3. Step 3: Cross multiply
    1,292.25x = 1,783.86 × 873.18
  4. Step 4: Simplify right side
    1,292.25x = 1,557,630.87
  5. Step 5: Solve for x
    x = 1,557,630.87/1,292.25
  6. Step 6: Final answer
    x = 1,205.36

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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.