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Finding the Fourth Proportional to 18,666.86, 28,009.32 and 9,308.21

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Solution

The fourth proportional to 18,666.86, 28,009.32 and 9,308.21 is: 13,966.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,666.86 : 28,009.32 = 9,308.21 : x
  2. Step 2: Convert to fraction form
    18,666.86/28,009.32 = 9,308.21/x
  3. Step 3: Cross multiply
    18,666.86x = 28,009.32 × 9,308.21
  4. Step 4: Simplify right side
    18,666.86x = 260,716,488.67
  5. Step 5: Solve for x
    x = 260,716,488.67/18,666.86
  6. Step 6: Final answer
    x = 13,966.81

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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.