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Finding the Fourth Proportional to 45,138.70, 67,718.85 and 18,828.82

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Solution

The fourth proportional to 45,138.70, 67,718.85 and 18,828.82 is: 28,247.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,138.70 : 67,718.85 = 18,828.82 : x
  2. Step 2: Convert to fraction form
    45,138.70/67,718.85 = 18,828.82/x
  3. Step 3: Cross multiply
    45,138.70x = 67,718.85 × 18,828.82
  4. Step 4: Simplify right side
    45,138.70x = 1,275,066,037.26
  5. Step 5: Solve for x
    x = 1,275,066,037.26/45,138.70
  6. Step 6: Final answer
    x = 28,247.74

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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.