Home / 20,812.28-28,712.92-12,840.68

Finding the Fourth Proportional to 20,812.28, 28,712.92 and 12,840.68

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Solution

The fourth proportional to 20,812.28, 28,712.92 and 12,840.68 is: 17,715.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.28 : 28,712.92 = 12,840.68 : x
  2. Step 2: Convert to fraction form
    20,812.28/28,712.92 = 12,840.68/x
  3. Step 3: Cross multiply
    20,812.28x = 28,712.92 × 12,840.68
  4. Step 4: Simplify right side
    20,812.28x = 368,693,417.59
  5. Step 5: Solve for x
    x = 368,693,417.59/20,812.28
  6. Step 6: Final answer
    x = 17,715.19

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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.