Home / 28,155.72-38,855.70-15,581.64

Finding the Fourth Proportional to 28,155.72, 38,855.70 and 15,581.64

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Solution

The fourth proportional to 28,155.72, 38,855.70 and 15,581.64 is: 21,503.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,155.72 : 38,855.70 = 15,581.64 : x
  2. Step 2: Convert to fraction form
    28,155.72/38,855.70 = 15,581.64/x
  3. Step 3: Cross multiply
    28,155.72x = 38,855.70 × 15,581.64
  4. Step 4: Simplify right side
    28,155.72x = 605,435,529.35
  5. Step 5: Solve for x
    x = 605,435,529.35/28,155.72
  6. Step 6: Final answer
    x = 21,503.11

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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.