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Finding the Fourth Proportional to 679,990.71, 938,418.92 and 393,455.37

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Solution

The fourth proportional to 679,990.71, 938,418.92 and 393,455.37 is: 542,986.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,990.71 : 938,418.92 = 393,455.37 : x
  2. Step 2: Convert to fraction form
    679,990.71/938,418.92 = 393,455.37/x
  3. Step 3: Cross multiply
    679,990.71x = 938,418.92 × 393,455.37
  4. Step 4: Simplify right side
    679,990.71x = 369,225,961,416.32
  5. Step 5: Solve for x
    x = 369,225,961,416.32/679,990.71
  6. Step 6: Final answer
    x = 542,986.77

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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.