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Finding the Fourth Proportional to 208,609.01, 312,809.95 and 66,435.74

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Solution

The fourth proportional to 208,609.01, 312,809.95 and 66,435.74 is: 99,620.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,609.01 : 312,809.95 = 66,435.74 : x
  2. Step 2: Convert to fraction form
    208,609.01/312,809.95 = 66,435.74/x
  3. Step 3: Cross multiply
    208,609.01x = 312,809.95 × 66,435.74
  4. Step 4: Simplify right side
    208,609.01x = 20,781,761,959.20
  5. Step 5: Solve for x
    x = 20,781,761,959.20/208,609.01
  6. Step 6: Final answer
    x = 99,620.64

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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.