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Finding the Fourth Proportional to 679,987.71, 938,414.77 and 393,452.37

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Solution

The fourth proportional to 679,987.71, 938,414.77 and 393,452.37 is: 542,982.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,987.71 : 938,414.77 = 393,452.37 : x
  2. Step 2: Convert to fraction form
    679,987.71/938,414.77 = 393,452.37/x
  3. Step 3: Cross multiply
    679,987.71x = 938,414.77 × 393,452.37
  4. Step 4: Simplify right side
    679,987.71x = 369,221,514,315.87
  5. Step 5: Solve for x
    x = 369,221,514,315.87/679,987.71
  6. Step 6: Final answer
    x = 542,982.63

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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.