Home / 20,640.18-28,483.20-11,208.81

Finding the Fourth Proportional to 20,640.18, 28,483.20 and 11,208.81

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Solution

The fourth proportional to 20,640.18, 28,483.20 and 11,208.81 is: 15,468.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.18 : 28,483.20 = 11,208.81 : x
  2. Step 2: Convert to fraction form
    20,640.18/28,483.20 = 11,208.81/x
  3. Step 3: Cross multiply
    20,640.18x = 28,483.20 × 11,208.81
  4. Step 4: Simplify right side
    20,640.18x = 319,262,776.99
  5. Step 5: Solve for x
    x = 319,262,776.99/20,640.18
  6. Step 6: Final answer
    x = 15,468.02

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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.