Home / 20,929.81-28,885.17-11,978.59

Finding the Fourth Proportional to 20,929.81, 28,885.17 and 11,978.59

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Solution

The fourth proportional to 20,929.81, 28,885.17 and 11,978.59 is: 16,531.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,929.81 : 28,885.17 = 11,978.59 : x
  2. Step 2: Convert to fraction form
    20,929.81/28,885.17 = 11,978.59/x
  3. Step 3: Cross multiply
    20,929.81x = 28,885.17 × 11,978.59
  4. Step 4: Simplify right side
    20,929.81x = 346,003,608.51
  5. Step 5: Solve for x
    x = 346,003,608.51/20,929.81
  6. Step 6: Final answer
    x = 16,531.62

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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.