Home / 20,390.91-28,138.00-11,316.76

Finding the Fourth Proportional to 20,390.91, 28,138.00 and 11,316.76

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Solution

The fourth proportional to 20,390.91, 28,138.00 and 11,316.76 is: 15,616.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.91 : 28,138.00 = 11,316.76 : x
  2. Step 2: Convert to fraction form
    20,390.91/28,138.00 = 11,316.76/x
  3. Step 3: Cross multiply
    20,390.91x = 28,138.00 × 11,316.76
  4. Step 4: Simplify right side
    20,390.91x = 318,430,795.61
  5. Step 5: Solve for x
    x = 318,430,795.61/20,390.91
  6. Step 6: Final answer
    x = 15,616.31

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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.