Home / 20,812.96-28,723.80-12,429.28

Finding the Fourth Proportional to 20,812.96, 28,723.80 and 12,429.28

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Solution

The fourth proportional to 20,812.96, 28,723.80 and 12,429.28 is: 17,153.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.96 : 28,723.80 = 12,429.28 : x
  2. Step 2: Convert to fraction form
    20,812.96/28,723.80 = 12,429.28/x
  3. Step 3: Cross multiply
    20,812.96x = 28,723.80 × 12,429.28
  4. Step 4: Simplify right side
    20,812.96x = 357,016,152.86
  5. Step 5: Solve for x
    x = 357,016,152.86/20,812.96
  6. Step 6: Final answer
    x = 17,153.55

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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.