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Finding the Fourth Proportional to 84,682.80, 126,987.30 and 28,507.84

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Solution

The fourth proportional to 84,682.80, 126,987.30 and 28,507.84 is: 42,749.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,682.80 : 126,987.30 = 28,507.84 : x
  2. Step 2: Convert to fraction form
    84,682.80/126,987.30 = 28,507.84/x
  3. Step 3: Cross multiply
    84,682.80x = 126,987.30 × 28,507.84
  4. Step 4: Simplify right side
    84,682.80x = 3,620,133,630.43
  5. Step 5: Solve for x
    x = 3,620,133,630.43/84,682.80
  6. Step 6: Final answer
    x = 42,749.34

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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.