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Finding the Fourth Proportional to 717,703.44, 990,426 and 395,406

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Solution

The fourth proportional to 717,703.44, 990,426 and 395,406 is: 545,657.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,703.44 : 990,426 = 395,406 : x
  2. Step 2: Convert to fraction form
    717,703.44/990,426 = 395,406/x
  3. Step 3: Cross multiply
    717,703.44x = 990,426 × 395,406
  4. Step 4: Simplify right side
    717,703.44x = 391,620,382,956
  5. Step 5: Solve for x
    x = 391,620,382,956/717,703.44
  6. Step 6: Final answer
    x = 545,657.66

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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.