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Finding the Fourth Proportional to 20,005.70, 30,008.55 and 6,858.20

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Solution

The fourth proportional to 20,005.70, 30,008.55 and 6,858.20 is: 10,287.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,005.70 : 30,008.55 = 6,858.20 : x
  2. Step 2: Convert to fraction form
    20,005.70/30,008.55 = 6,858.20/x
  3. Step 3: Cross multiply
    20,005.70x = 30,008.55 × 6,858.20
  4. Step 4: Simplify right side
    20,005.70x = 205,804,637.61
  5. Step 5: Solve for x
    x = 205,804,637.61/20,005.70
  6. Step 6: Final answer
    x = 10,287.30

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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.