Home / 20,905.29-28,839.96-12,407.76

Finding the Fourth Proportional to 20,905.29, 28,839.96 and 12,407.76

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Solution

The fourth proportional to 20,905.29, 28,839.96 and 12,407.76 is: 17,117.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.29 : 28,839.96 = 12,407.76 : x
  2. Step 2: Convert to fraction form
    20,905.29/28,839.96 = 12,407.76/x
  3. Step 3: Cross multiply
    20,905.29x = 28,839.96 × 12,407.76
  4. Step 4: Simplify right side
    20,905.29x = 357,839,302.09
  5. Step 5: Solve for x
    x = 357,839,302.09/20,905.29
  6. Step 6: Final answer
    x = 17,117.17

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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.