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Finding the Fourth Proportional to 28,039.76, 38,694.88 and 15,465.32

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Solution

The fourth proportional to 28,039.76, 38,694.88 and 15,465.32 is: 21,342.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,039.76 : 38,694.88 = 15,465.32 : x
  2. Step 2: Convert to fraction form
    28,039.76/38,694.88 = 15,465.32/x
  3. Step 3: Cross multiply
    28,039.76x = 38,694.88 × 15,465.32
  4. Step 4: Simplify right side
    28,039.76x = 598,428,701.56
  5. Step 5: Solve for x
    x = 598,428,701.56/28,039.76
  6. Step 6: Final answer
    x = 21,342.15

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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.