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Finding the Fourth Proportional to 668,000.28, 921,878.46 and 396,229.08

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Solution

The fourth proportional to 668,000.28, 921,878.46 and 396,229.08 is: 546,818.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    668,000.28 : 921,878.46 = 396,229.08 : x
  2. Step 2: Convert to fraction form
    668,000.28/921,878.46 = 396,229.08/x
  3. Step 3: Cross multiply
    668,000.28x = 921,878.46 × 396,229.08
  4. Step 4: Simplify right side
    668,000.28x = 365,275,054,077.62
  5. Step 5: Solve for x
    x = 365,275,054,077.62/668,000.28
  6. Step 6: Final answer
    x = 546,818.71

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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.