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Finding the Fourth Proportional to 19,406.40, 29,109.60 and 8,311.20

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Solution

The fourth proportional to 19,406.40, 29,109.60 and 8,311.20 is: 12,466.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,406.40 : 29,109.60 = 8,311.20 : x
  2. Step 2: Convert to fraction form
    19,406.40/29,109.60 = 8,311.20/x
  3. Step 3: Cross multiply
    19,406.40x = 29,109.60 × 8,311.20
  4. Step 4: Simplify right side
    19,406.40x = 241,935,707.52
  5. Step 5: Solve for x
    x = 241,935,707.52/19,406.40
  6. Step 6: Final answer
    x = 12,466.80

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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.