Home / 20,877.40-28,813.10-13,330.68

Finding the Fourth Proportional to 20,877.40, 28,813.10 and 13,330.68

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Solution

The fourth proportional to 20,877.40, 28,813.10 and 13,330.68 is: 18,397.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,877.40 : 28,813.10 = 13,330.68 : x
  2. Step 2: Convert to fraction form
    20,877.40/28,813.10 = 13,330.68/x
  3. Step 3: Cross multiply
    20,877.40x = 28,813.10 × 13,330.68
  4. Step 4: Simplify right side
    20,877.40x = 384,098,215.91
  5. Step 5: Solve for x
    x = 384,098,215.91/20,877.40
  6. Step 6: Final answer
    x = 18,397.80

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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.