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Finding the Fourth Proportional to 28,611.99, 39,483.45 and 15,865.70

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Solution

The fourth proportional to 28,611.99, 39,483.45 and 15,865.70 is: 21,894.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,611.99 : 39,483.45 = 15,865.70 : x
  2. Step 2: Convert to fraction form
    28,611.99/39,483.45 = 15,865.70/x
  3. Step 3: Cross multiply
    28,611.99x = 39,483.45 × 15,865.70
  4. Step 4: Simplify right side
    28,611.99x = 626,432,375.25
  5. Step 5: Solve for x
    x = 626,432,375.25/28,611.99
  6. Step 6: Final answer
    x = 21,894.05

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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.