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Finding the Fourth Proportional to 18,963.47, 28,445.21 and 7,867.17

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Solution

The fourth proportional to 18,963.47, 28,445.21 and 7,867.17 is: 11,800.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,963.47 : 28,445.21 = 7,867.17 : x
  2. Step 2: Convert to fraction form
    18,963.47/28,445.21 = 7,867.17/x
  3. Step 3: Cross multiply
    18,963.47x = 28,445.21 × 7,867.17
  4. Step 4: Simplify right side
    18,963.47x = 223,783,302.76
  5. Step 5: Solve for x
    x = 223,783,302.76/18,963.47
  6. Step 6: Final answer
    x = 11,800.76

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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.