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Finding the Fourth Proportional to 393,218.94, 587,161.31 and 312,349.15

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Solution

The fourth proportional to 393,218.94, 587,161.31 and 312,349.15 is: 466,405.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,218.94 : 587,161.31 = 312,349.15 : x
  2. Step 2: Convert to fraction form
    393,218.94/587,161.31 = 312,349.15/x
  3. Step 3: Cross multiply
    393,218.94x = 587,161.31 × 312,349.15
  4. Step 4: Simplify right side
    393,218.94x = 183,399,335,404.36
  5. Step 5: Solve for x
    x = 183,399,335,404.36/393,218.94
  6. Step 6: Final answer
    x = 466,405.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.