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Finding the Fourth Proportional to 660,336.80, 990,505.20 and 260,771.90

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Solution

The fourth proportional to 660,336.80, 990,505.20 and 260,771.90 is: 391,157.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,336.80 : 990,505.20 = 260,771.90 : x
  2. Step 2: Convert to fraction form
    660,336.80/990,505.20 = 260,771.90/x
  3. Step 3: Cross multiply
    660,336.80x = 990,505.20 × 260,771.90
  4. Step 4: Simplify right side
    660,336.80x = 258,295,922,963.88
  5. Step 5: Solve for x
    x = 258,295,922,963.88/660,336.80
  6. Step 6: Final answer
    x = 391,157.85

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.