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Finding the Fourth Proportional to 15,289.13, 21,099.03 and 8,920.10

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Solution

The fourth proportional to 15,289.13, 21,099.03 and 8,920.10 is: 12,309.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,289.13 : 21,099.03 = 8,920.10 : x
  2. Step 2: Convert to fraction form
    15,289.13/21,099.03 = 8,920.10/x
  3. Step 3: Cross multiply
    15,289.13x = 21,099.03 × 8,920.10
  4. Step 4: Simplify right side
    15,289.13x = 188,205,352.01
  5. Step 5: Solve for x
    x = 188,205,352.01/15,289.13
  6. Step 6: Final answer
    x = 12,309.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.