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Finding the Fourth Proportional to 668,309.94, 921,968.84 and 396,389.30

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Solution

The fourth proportional to 668,309.94, 921,968.84 and 396,389.30 is: 546,839.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    668,309.94 : 921,968.84 = 396,389.30 : x
  2. Step 2: Convert to fraction form
    668,309.94/921,968.84 = 396,389.30/x
  3. Step 3: Cross multiply
    668,309.94x = 921,968.84 × 396,389.30
  4. Step 4: Simplify right side
    668,309.94x = 365,458,579,490.54
  5. Step 5: Solve for x
    x = 365,458,579,490.54/668,309.94
  6. Step 6: Final answer
    x = 546,839.96

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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.