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Finding the Fourth Proportional to 20,139.30, 30,187.08 and 6,984.50

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Solution

The fourth proportional to 20,139.30, 30,187.08 and 6,984.50 is: 10,469.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.30 : 30,187.08 = 6,984.50 : x
  2. Step 2: Convert to fraction form
    20,139.30/30,187.08 = 6,984.50/x
  3. Step 3: Cross multiply
    20,139.30x = 30,187.08 × 6,984.50
  4. Step 4: Simplify right side
    20,139.30x = 210,841,509.32
  5. Step 5: Solve for x
    x = 210,841,509.32/20,139.30
  6. Step 6: Final answer
    x = 10,469.16

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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.