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Finding the Fourth Proportional to 445,112.52, 613,920.42 and 309,146.64

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Solution

The fourth proportional to 445,112.52, 613,920.42 and 309,146.64 is: 426,389.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,112.52 : 613,920.42 = 309,146.64 : x
  2. Step 2: Convert to fraction form
    445,112.52/613,920.42 = 309,146.64/x
  3. Step 3: Cross multiply
    445,112.52x = 613,920.42 × 309,146.64
  4. Step 4: Simplify right side
    445,112.52x = 189,791,435,070.39
  5. Step 5: Solve for x
    x = 189,791,435,070.39/445,112.52
  6. Step 6: Final answer
    x = 426,389.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.