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Finding the Fourth Proportional to 74,403.40, 111,605.10 and 18,999.40

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Solution

The fourth proportional to 74,403.40, 111,605.10 and 18,999.40 is: 28,499.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,403.40 : 111,605.10 = 18,999.40 : x
  2. Step 2: Convert to fraction form
    74,403.40/111,605.10 = 18,999.40/x
  3. Step 3: Cross multiply
    74,403.40x = 111,605.10 × 18,999.40
  4. Step 4: Simplify right side
    74,403.40x = 2,120,429,936.94
  5. Step 5: Solve for x
    x = 2,120,429,936.94/74,403.40
  6. Step 6: Final answer
    x = 28,499.10

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Similar ratio
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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.