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Finding the Fourth Proportional to 209,999.20, 314,998.80 and 206,543.20

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Solution

The fourth proportional to 209,999.20, 314,998.80 and 206,543.20 is: 309,814.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,999.20 : 314,998.80 = 206,543.20 : x
  2. Step 2: Convert to fraction form
    209,999.20/314,998.80 = 206,543.20/x
  3. Step 3: Cross multiply
    209,999.20x = 314,998.80 × 206,543.20
  4. Step 4: Simplify right side
    209,999.20x = 65,060,860,148.16
  5. Step 5: Solve for x
    x = 65,060,860,148.16/209,999.20
  6. Step 6: Final answer
    x = 309,814.80

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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.