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Finding the Fourth Proportional to 717,911.86, 990,724.98 and 395,633.48

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Solution

The fourth proportional to 717,911.86, 990,724.98 and 395,633.48 is: 545,977.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,911.86 : 990,724.98 = 395,633.48 : x
  2. Step 2: Convert to fraction form
    717,911.86/990,724.98 = 395,633.48/x
  3. Step 3: Cross multiply
    717,911.86x = 990,724.98 × 395,633.48
  4. Step 4: Simplify right side
    717,911.86x = 391,963,971,560.33
  5. Step 5: Solve for x
    x = 391,963,971,560.33/717,911.86
  6. Step 6: Final answer
    x = 545,977.85

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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.