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Finding the Fourth Proportional to 18,688.47, 28,009.03 and 8,155.68

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Solution

The fourth proportional to 18,688.47, 28,009.03 and 8,155.68 is: 12,223.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,688.47 : 28,009.03 = 8,155.68 : x
  2. Step 2: Convert to fraction form
    18,688.47/28,009.03 = 8,155.68/x
  3. Step 3: Cross multiply
    18,688.47x = 28,009.03 × 8,155.68
  4. Step 4: Simplify right side
    18,688.47x = 228,432,685.79
  5. Step 5: Solve for x
    x = 228,432,685.79/18,688.47
  6. Step 6: Final answer
    x = 12,223.19

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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.