Home / 20,931.78-28,885.82-11,979.46

Finding the Fourth Proportional to 20,931.78, 28,885.82 and 11,979.46

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Solution

The fourth proportional to 20,931.78, 28,885.82 and 11,979.46 is: 16,531.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.78 : 28,885.82 = 11,979.46 : x
  2. Step 2: Convert to fraction form
    20,931.78/28,885.82 = 11,979.46/x
  3. Step 3: Cross multiply
    20,931.78x = 28,885.82 × 11,979.46
  4. Step 4: Simplify right side
    20,931.78x = 346,036,501.47
  5. Step 5: Solve for x
    x = 346,036,501.47/20,931.78
  6. Step 6: Final answer
    x = 16,531.63

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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.