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Finding the Fourth Proportional to 13,390.65, 20,066.17 and 12,641.77

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Solution

The fourth proportional to 13,390.65, 20,066.17 and 12,641.77 is: 18,943.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.65 : 20,066.17 = 12,641.77 : x
  2. Step 2: Convert to fraction form
    13,390.65/20,066.17 = 12,641.77/x
  3. Step 3: Cross multiply
    13,390.65x = 20,066.17 × 12,641.77
  4. Step 4: Simplify right side
    13,390.65x = 253,671,905.92
  5. Step 5: Solve for x
    x = 253,671,905.92/13,390.65
  6. Step 6: Final answer
    x = 18,943.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.