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Finding the Fourth Proportional to 1,292.12, 1,783.58 and 872.20

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Solution

The fourth proportional to 1,292.12, 1,783.58 and 872.20 is: 1,203.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.12 : 1,783.58 = 872.20 : x
  2. Step 2: Convert to fraction form
    1,292.12/1,783.58 = 872.20/x
  3. Step 3: Cross multiply
    1,292.12x = 1,783.58 × 872.20
  4. Step 4: Simplify right side
    1,292.12x = 1,555,638.48
  5. Step 5: Solve for x
    x = 1,555,638.48/1,292.12
  6. Step 6: Final answer
    x = 1,203.94

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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.