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Finding the Fourth Proportional to 15,170.16, 20,935.53 and 8,455.83

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Solution

The fourth proportional to 15,170.16, 20,935.53 and 8,455.83 is: 11,669.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,170.16 : 20,935.53 = 8,455.83 : x
  2. Step 2: Convert to fraction form
    15,170.16/20,935.53 = 8,455.83/x
  3. Step 3: Cross multiply
    15,170.16x = 20,935.53 × 8,455.83
  4. Step 4: Simplify right side
    15,170.16x = 177,027,303.78
  5. Step 5: Solve for x
    x = 177,027,303.78/15,170.16
  6. Step 6: Final answer
    x = 11,669.45

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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.