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Finding the Fourth Proportional to 28,256.04, 38,993.04 and 15,680.88

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Solution

The fourth proportional to 28,256.04, 38,993.04 and 15,680.88 is: 21,639.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,256.04 : 38,993.04 = 15,680.88 : x
  2. Step 2: Convert to fraction form
    28,256.04/38,993.04 = 15,680.88/x
  3. Step 3: Cross multiply
    28,256.04x = 38,993.04 × 15,680.88
  4. Step 4: Simplify right side
    28,256.04x = 611,445,181.08
  5. Step 5: Solve for x
    x = 611,445,181.08/28,256.04
  6. Step 6: Final answer
    x = 21,639.45

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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.