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Finding the Fourth Proportional to 665,871.71, 918,691.47 and 394,033.10

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Solution

The fourth proportional to 665,871.71, 918,691.47 and 394,033.10 is: 543,640.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,871.71 : 918,691.47 = 394,033.10 : x
  2. Step 2: Convert to fraction form
    665,871.71/918,691.47 = 394,033.10/x
  3. Step 3: Cross multiply
    665,871.71x = 918,691.47 × 394,033.10
  4. Step 4: Simplify right side
    665,871.71x = 361,994,843,274.20
  5. Step 5: Solve for x
    x = 361,994,843,274.20/665,871.71
  6. Step 6: Final answer
    x = 543,640.52

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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.