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Finding the Fourth Proportional to 15,209.66, 20,980.58 and 9,155.69

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Solution

The fourth proportional to 15,209.66, 20,980.58 and 9,155.69 is: 12,629.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,209.66 : 20,980.58 = 9,155.69 : x
  2. Step 2: Convert to fraction form
    15,209.66/20,980.58 = 9,155.69/x
  3. Step 3: Cross multiply
    15,209.66x = 20,980.58 × 9,155.69
  4. Step 4: Simplify right side
    15,209.66x = 192,091,640.72
  5. Step 5: Solve for x
    x = 192,091,640.72/15,209.66
  6. Step 6: Final answer
    x = 12,629.58

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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.