Home / 28,155.75-38,856.15-15,580.50

Finding the Fourth Proportional to 28,155.75, 38,856.15 and 15,580.50

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Solution

The fourth proportional to 28,155.75, 38,856.15 and 15,580.50 is: 21,501.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,155.75 : 38,856.15 = 15,580.50 : x
  2. Step 2: Convert to fraction form
    28,155.75/38,856.15 = 15,580.50/x
  3. Step 3: Cross multiply
    28,155.75x = 38,856.15 × 15,580.50
  4. Step 4: Simplify right side
    28,155.75x = 605,398,245.08
  5. Step 5: Solve for x
    x = 605,398,245.08/28,155.75
  6. Step 6: Final answer
    x = 21,501.76

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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.