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Finding the Fourth Proportional to 303,421.20, 455,131.80 and 103,723.80

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Solution

The fourth proportional to 303,421.20, 455,131.80 and 103,723.80 is: 155,585.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    303,421.20 : 455,131.80 = 103,723.80 : x
  2. Step 2: Convert to fraction form
    303,421.20/455,131.80 = 103,723.80/x
  3. Step 3: Cross multiply
    303,421.20x = 455,131.80 × 103,723.80
  4. Step 4: Simplify right side
    303,421.20x = 47,207,999,796.84
  5. Step 5: Solve for x
    x = 47,207,999,796.84/303,421.20
  6. Step 6: Final answer
    x = 155,585.70

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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.