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Finding the Fourth Proportional to 300,385.47, 450,621.93 and 90,039.81

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Solution

The fourth proportional to 300,385.47, 450,621.93 and 90,039.81 is: 135,072.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    300,385.47 : 450,621.93 = 90,039.81 : x
  2. Step 2: Convert to fraction form
    300,385.47/450,621.93 = 90,039.81/x
  3. Step 3: Cross multiply
    300,385.47x = 450,621.93 × 90,039.81
  4. Step 4: Simplify right side
    300,385.47x = 40,573,912,959.03
  5. Step 5: Solve for x
    x = 40,573,912,959.03/300,385.47
  6. Step 6: Final answer
    x = 135,072.82

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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.