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Finding the Fourth Proportional to 28,161.78, 38,863.53 and 15,586.50

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Solution

The fourth proportional to 28,161.78, 38,863.53 and 15,586.50 is: 21,509.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,161.78 : 38,863.53 = 15,586.50 : x
  2. Step 2: Convert to fraction form
    28,161.78/38,863.53 = 15,586.50/x
  3. Step 3: Cross multiply
    28,161.78x = 38,863.53 × 15,586.50
  4. Step 4: Simplify right side
    28,161.78x = 605,746,410.35
  5. Step 5: Solve for x
    x = 605,746,410.35/28,161.78
  6. Step 6: Final answer
    x = 21,509.52

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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.