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Finding the Fourth Proportional to 13,765.95, 18,998.19 and 8,728.32

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Solution

The fourth proportional to 13,765.95, 18,998.19 and 8,728.32 is: 12,045.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,765.95 : 18,998.19 = 8,728.32 : x
  2. Step 2: Convert to fraction form
    13,765.95/18,998.19 = 8,728.32/x
  3. Step 3: Cross multiply
    13,765.95x = 18,998.19 × 8,728.32
  4. Step 4: Simplify right side
    13,765.95x = 165,822,281.74
  5. Step 5: Solve for x
    x = 165,822,281.74/13,765.95
  6. Step 6: Final answer
    x = 12,045.83

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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.