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Finding the Fourth Proportional to 660,688.14, 991,179.90 and 211,435.95

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Solution

The fourth proportional to 660,688.14, 991,179.90 and 211,435.95 is: 317,201.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,688.14 : 991,179.90 = 211,435.95 : x
  2. Step 2: Convert to fraction form
    660,688.14/991,179.90 = 211,435.95/x
  3. Step 3: Cross multiply
    660,688.14x = 991,179.90 × 211,435.95
  4. Step 4: Simplify right side
    660,688.14x = 209,571,063,777.41
  5. Step 5: Solve for x
    x = 209,571,063,777.41/660,688.14
  6. Step 6: Final answer
    x = 317,201.19

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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.