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Finding the Fourth Proportional to 19,999.40, 30,009.90 and 8,313.80

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Solution

The fourth proportional to 19,999.40, 30,009.90 and 8,313.80 is: 12,475.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,999.40 : 30,009.90 = 8,313.80 : x
  2. Step 2: Convert to fraction form
    19,999.40/30,009.90 = 8,313.80/x
  3. Step 3: Cross multiply
    19,999.40x = 30,009.90 × 8,313.80
  4. Step 4: Simplify right side
    19,999.40x = 249,496,306.62
  5. Step 5: Solve for x
    x = 249,496,306.62/19,999.40
  6. Step 6: Final answer
    x = 12,475.19

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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.