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Finding the Fourth Proportional to 717,489.74, 990,135.72 and 395,199.83

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Solution

The fourth proportional to 717,489.74, 990,135.72 and 395,199.83 is: 545,375.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,489.74 : 990,135.72 = 395,199.83 : x
  2. Step 2: Convert to fraction form
    717,489.74/990,135.72 = 395,199.83/x
  3. Step 3: Cross multiply
    717,489.74x = 990,135.72 × 395,199.83
  4. Step 4: Simplify right side
    717,489.74x = 391,301,470,696.27
  5. Step 5: Solve for x
    x = 391,301,470,696.27/717,489.74
  6. Step 6: Final answer
    x = 545,375.70

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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.