Home / 15,135.39-20,886.39-8,420.76

Finding the Fourth Proportional to 15,135.39, 20,886.39 and 8,420.76

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Solution

The fourth proportional to 15,135.39, 20,886.39 and 8,420.76 is: 11,620.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.39 : 20,886.39 = 8,420.76 : x
  2. Step 2: Convert to fraction form
    15,135.39/20,886.39 = 8,420.76/x
  3. Step 3: Cross multiply
    15,135.39x = 20,886.39 × 8,420.76
  4. Step 4: Simplify right side
    15,135.39x = 175,879,277.46
  5. Step 5: Solve for x
    x = 175,879,277.46/15,135.39
  6. Step 6: Final answer
    x = 11,620.40

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Double scale
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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.