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Finding the Fourth Proportional to 208,605.48, 312,804.68 and 66,432.20

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Solution

The fourth proportional to 208,605.48, 312,804.68 and 66,432.20 is: 99,615.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,605.48 : 312,804.68 = 66,432.20 : x
  2. Step 2: Convert to fraction form
    208,605.48/312,804.68 = 66,432.20/x
  3. Step 3: Cross multiply
    208,605.48x = 312,804.68 × 66,432.20
  4. Step 4: Simplify right side
    208,605.48x = 20,780,303,062.70
  5. Step 5: Solve for x
    x = 20,780,303,062.70/208,605.48
  6. Step 6: Final answer
    x = 99,615.33

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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.