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Finding the Fourth Proportional to 209,812.30, 314,849.67 and 85,153.30

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Solution

The fourth proportional to 209,812.30, 314,849.67 and 85,153.30 is: 127,783.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,812.30 : 314,849.67 = 85,153.30 : x
  2. Step 2: Convert to fraction form
    209,812.30/314,849.67 = 85,153.30/x
  3. Step 3: Cross multiply
    209,812.30x = 314,849.67 × 85,153.30
  4. Step 4: Simplify right side
    209,812.30x = 26,810,488,404.41
  5. Step 5: Solve for x
    x = 26,810,488,404.41/209,812.30
  6. Step 6: Final answer
    x = 127,783.21

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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.