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Finding the Fourth Proportional to 18,820.31, 28,231.86 and 6,340.28

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Solution

The fourth proportional to 18,820.31, 28,231.86 and 6,340.28 is: 9,510.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,820.31 : 28,231.86 = 6,340.28 : x
  2. Step 2: Convert to fraction form
    18,820.31/28,231.86 = 6,340.28/x
  3. Step 3: Cross multiply
    18,820.31x = 28,231.86 × 6,340.28
  4. Step 4: Simplify right side
    18,820.31x = 178,997,897.32
  5. Step 5: Solve for x
    x = 178,997,897.32/18,820.31
  6. Step 6: Final answer
    x = 9,510.89

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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.