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Finding the Fourth Proportional to 15,146.80, 20,903.59 and 9,179.05

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Solution

The fourth proportional to 15,146.80, 20,903.59 and 9,179.05 is: 12,667.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,146.80 : 20,903.59 = 9,179.05 : x
  2. Step 2: Convert to fraction form
    15,146.80/20,903.59 = 9,179.05/x
  3. Step 3: Cross multiply
    15,146.80x = 20,903.59 × 9,179.05
  4. Step 4: Simplify right side
    15,146.80x = 191,875,097.79
  5. Step 5: Solve for x
    x = 191,875,097.79/15,146.80
  6. Step 6: Final answer
    x = 12,667.70

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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.