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Finding the Fourth Proportional to 28,102.68, 38,783.88 and 15,529.68

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Solution

The fourth proportional to 28,102.68, 38,783.88 and 15,529.68 is: 21,432.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,102.68 : 38,783.88 = 15,529.68 : x
  2. Step 2: Convert to fraction form
    28,102.68/38,783.88 = 15,529.68/x
  3. Step 3: Cross multiply
    28,102.68x = 38,783.88 × 15,529.68
  4. Step 4: Simplify right side
    28,102.68x = 602,301,245.56
  5. Step 5: Solve for x
    x = 602,301,245.56/28,102.68
  6. Step 6: Final answer
    x = 21,432.16

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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.