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Finding the Fourth Proportional to 12,585.90, 18,878.88 and 3,820.88

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Solution

The fourth proportional to 12,585.90, 18,878.88 and 3,820.88 is: 5,731.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,585.90 : 18,878.88 = 3,820.88 : x
  2. Step 2: Convert to fraction form
    12,585.90/18,878.88 = 3,820.88/x
  3. Step 3: Cross multiply
    12,585.90x = 18,878.88 × 3,820.88
  4. Step 4: Simplify right side
    12,585.90x = 72,133,935.01
  5. Step 5: Solve for x
    x = 72,133,935.01/12,585.90
  6. Step 6: Final answer
    x = 5,731.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.