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Finding the Fourth Proportional to 660,685.98, 991,015.50 and 211,406.78

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Solution

The fourth proportional to 660,685.98, 991,015.50 and 211,406.78 is: 317,105.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,685.98 : 991,015.50 = 211,406.78 : x
  2. Step 2: Convert to fraction form
    660,685.98/991,015.50 = 211,406.78/x
  3. Step 3: Cross multiply
    660,685.98x = 991,015.50 × 211,406.78
  4. Step 4: Simplify right side
    660,685.98x = 209,507,395,785.09
  5. Step 5: Solve for x
    x = 209,507,395,785.09/660,685.98
  6. Step 6: Final answer
    x = 317,105.86

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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.