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Finding the Fourth Proportional to 18,665.76, 28,012.32 and 9,902.40

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Solution

The fourth proportional to 18,665.76, 28,012.32 and 9,902.40 is: 14,860.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,665.76 : 28,012.32 = 9,902.40 : x
  2. Step 2: Convert to fraction form
    18,665.76/28,012.32 = 9,902.40/x
  3. Step 3: Cross multiply
    18,665.76x = 28,012.32 × 9,902.40
  4. Step 4: Simplify right side
    18,665.76x = 277,389,197.57
  5. Step 5: Solve for x
    x = 277,389,197.57/18,665.76
  6. Step 6: Final answer
    x = 14,860.86

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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.