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Finding the Fourth Proportional to 717,899.60, 990,708 and 395,621.26

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Solution

The fourth proportional to 717,899.60, 990,708 and 395,621.26 is: 545,960.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,899.60 : 990,708 = 395,621.26 : x
  2. Step 2: Convert to fraction form
    717,899.60/990,708 = 395,621.26/x
  3. Step 3: Cross multiply
    717,899.60x = 990,708 × 395,621.26
  4. Step 4: Simplify right side
    717,899.60x = 391,945,147,252.08
  5. Step 5: Solve for x
    x = 391,945,147,252.08/717,899.60
  6. Step 6: Final answer
    x = 545,960.95

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Similar ratio
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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.