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Finding the Fourth Proportional to 87,314.80, 130,991.40 and 28,140.40

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Solution

The fourth proportional to 87,314.80, 130,991.40 and 28,140.40 is: 42,216.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,314.80 : 130,991.40 = 28,140.40 : x
  2. Step 2: Convert to fraction form
    87,314.80/130,991.40 = 28,140.40/x
  3. Step 3: Cross multiply
    87,314.80x = 130,991.40 × 28,140.40
  4. Step 4: Simplify right side
    87,314.80x = 3,686,150,392.56
  5. Step 5: Solve for x
    x = 3,686,150,392.56/87,314.80
  6. Step 6: Final answer
    x = 42,216.79

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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.