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Finding the Fourth Proportional to 28,920.50, 39,910.35 and 15,672.50

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Solution

The fourth proportional to 28,920.50, 39,910.35 and 15,672.50 is: 21,628.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,920.50 : 39,910.35 = 15,672.50 : x
  2. Step 2: Convert to fraction form
    28,920.50/39,910.35 = 15,672.50/x
  3. Step 3: Cross multiply
    28,920.50x = 39,910.35 × 15,672.50
  4. Step 4: Simplify right side
    28,920.50x = 625,494,960.38
  5. Step 5: Solve for x
    x = 625,494,960.38/28,920.50
  6. Step 6: Final answer
    x = 21,628.08

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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.