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Finding the Fourth Proportional to 661,324.20, 991,986.30 and 345,877.80

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Solution

The fourth proportional to 661,324.20, 991,986.30 and 345,877.80 is: 518,816.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,324.20 : 991,986.30 = 345,877.80 : x
  2. Step 2: Convert to fraction form
    661,324.20/991,986.30 = 345,877.80/x
  3. Step 3: Cross multiply
    661,324.20x = 991,986.30 × 345,877.80
  4. Step 4: Simplify right side
    661,324.20x = 343,106,039,074.14
  5. Step 5: Solve for x
    x = 343,106,039,074.14/661,324.20
  6. Step 6: Final answer
    x = 518,816.70

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Double scale
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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.