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Finding the Fourth Proportional to 18,666.90, 28,004.51 and 6,820.65

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Solution

The fourth proportional to 18,666.90, 28,004.51 and 6,820.65 is: 10,232.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,666.90 : 28,004.51 = 6,820.65 : x
  2. Step 2: Convert to fraction form
    18,666.90/28,004.51 = 6,820.65/x
  3. Step 3: Cross multiply
    18,666.90x = 28,004.51 × 6,820.65
  4. Step 4: Simplify right side
    18,666.90x = 191,008,927.03
  5. Step 5: Solve for x
    x = 191,008,927.03/18,666.90
  6. Step 6: Final answer
    x = 10,232.49

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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.