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Finding the Fourth Proportional to 19,999.20, 30,000.48 and 8,313.60

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Solution

The fourth proportional to 19,999.20, 30,000.48 and 8,313.60 is: 12,471.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,999.20 : 30,000.48 = 8,313.60 : x
  2. Step 2: Convert to fraction form
    19,999.20/30,000.48 = 8,313.60/x
  3. Step 3: Cross multiply
    19,999.20x = 30,000.48 × 8,313.60
  4. Step 4: Simplify right side
    19,999.20x = 249,411,990.53
  5. Step 5: Solve for x
    x = 249,411,990.53/19,999.20
  6. Step 6: Final answer
    x = 12,471.10

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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.