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Finding the Fourth Proportional to 18,963.82, 28,407.63 and 9,447.46

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Solution

The fourth proportional to 18,963.82, 28,407.63 and 9,447.46 is: 14,152.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,963.82 : 28,407.63 = 9,447.46 : x
  2. Step 2: Convert to fraction form
    18,963.82/28,407.63 = 9,447.46/x
  3. Step 3: Cross multiply
    18,963.82x = 28,407.63 × 9,447.46
  4. Step 4: Simplify right side
    18,963.82x = 268,379,948.12
  5. Step 5: Solve for x
    x = 268,379,948.12/18,963.82
  6. Step 6: Final answer
    x = 14,152.21

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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.