Home / 28,078.56-38,748.11-15,331.70

Finding the Fourth Proportional to 28,078.56, 38,748.11 and 15,331.70

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Solution

The fourth proportional to 28,078.56, 38,748.11 and 15,331.70 is: 21,157.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,078.56 : 38,748.11 = 15,331.70 : x
  2. Step 2: Convert to fraction form
    28,078.56/38,748.11 = 15,331.70/x
  3. Step 3: Cross multiply
    28,078.56x = 38,748.11 × 15,331.70
  4. Step 4: Simplify right side
    28,078.56x = 594,074,127.69
  5. Step 5: Solve for x
    x = 594,074,127.69/28,078.56
  6. Step 6: Final answer
    x = 21,157.57

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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.