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Finding the Fourth Proportional to 28,124.78, 38,811.78 and 15,378.01

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Solution

The fourth proportional to 28,124.78, 38,811.78 and 15,378.01 is: 21,221.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,124.78 : 38,811.78 = 15,378.01 : x
  2. Step 2: Convert to fraction form
    28,124.78/38,811.78 = 15,378.01/x
  3. Step 3: Cross multiply
    28,124.78x = 38,811.78 × 15,378.01
  4. Step 4: Simplify right side
    28,124.78x = 596,847,940.96
  5. Step 5: Solve for x
    x = 596,847,940.96/28,124.78
  6. Step 6: Final answer
    x = 21,221.43

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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.