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Finding the Fourth Proportional to 209,810.80, 314,847.42 and 85,151.80

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Solution

The fourth proportional to 209,810.80, 314,847.42 and 85,151.80 is: 127,780.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,810.80 : 314,847.42 = 85,151.80 : x
  2. Step 2: Convert to fraction form
    209,810.80/314,847.42 = 85,151.80/x
  3. Step 3: Cross multiply
    209,810.80x = 314,847.42 × 85,151.80
  4. Step 4: Simplify right side
    209,810.80x = 26,809,824,538.36
  5. Step 5: Solve for x
    x = 26,809,824,538.36/209,810.80
  6. Step 6: Final answer
    x = 127,780.96

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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.