Home / 28,385.10-39,171.42-15,809.85

Finding the Fourth Proportional to 28,385.10, 39,171.42 and 15,809.85

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Solution

The fourth proportional to 28,385.10, 39,171.42 and 15,809.85 is: 21,817.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,385.10 : 39,171.42 = 15,809.85 : x
  2. Step 2: Convert to fraction form
    28,385.10/39,171.42 = 15,809.85/x
  3. Step 3: Cross multiply
    28,385.10x = 39,171.42 × 15,809.85
  4. Step 4: Simplify right side
    28,385.10x = 619,294,274.49
  5. Step 5: Solve for x
    x = 619,294,274.49/28,385.10
  6. Step 6: Final answer
    x = 21,817.58

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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.