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Finding the Fourth Proportional to 15,009.60, 20,719.08 and 13,434.96

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Solution

The fourth proportional to 15,009.60, 20,719.08 and 13,434.96 is: 18,545.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,009.60 : 20,719.08 = 13,434.96 : x
  2. Step 2: Convert to fraction form
    15,009.60/20,719.08 = 13,434.96/x
  3. Step 3: Cross multiply
    15,009.60x = 20,719.08 × 13,434.96
  4. Step 4: Simplify right side
    15,009.60x = 278,360,011.04
  5. Step 5: Solve for x
    x = 278,360,011.04/15,009.60
  6. Step 6: Final answer
    x = 18,545.46

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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.