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Finding the Fourth Proportional to 15,168.54, 20,934.16 and 9,120.77

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Solution

The fourth proportional to 15,168.54, 20,934.16 and 9,120.77 is: 12,587.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,168.54 : 20,934.16 = 9,120.77 : x
  2. Step 2: Convert to fraction form
    15,168.54/20,934.16 = 9,120.77/x
  3. Step 3: Cross multiply
    15,168.54x = 20,934.16 × 9,120.77
  4. Step 4: Simplify right side
    15,168.54x = 190,935,658.50
  5. Step 5: Solve for x
    x = 190,935,658.50/15,168.54
  6. Step 6: Final answer
    x = 12,587.61

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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.