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Finding the Fourth Proportional to 20,909.96, 28,855.79 and 12,413.79

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Solution

The fourth proportional to 20,909.96, 28,855.79 and 12,413.79 is: 17,131.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.96 : 28,855.79 = 12,413.79 : x
  2. Step 2: Convert to fraction form
    20,909.96/28,855.79 = 12,413.79/x
  3. Step 3: Cross multiply
    20,909.96x = 28,855.79 × 12,413.79
  4. Step 4: Simplify right side
    20,909.96x = 358,209,717.34
  5. Step 5: Solve for x
    x = 358,209,717.34/20,909.96
  6. Step 6: Final answer
    x = 17,131.06

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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.