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Finding the Fourth Proportional to 209,961.60, 314,985.60 and 69,820.80

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Solution

The fourth proportional to 209,961.60, 314,985.60 and 69,820.80 is: 104,745.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,961.60 : 314,985.60 = 69,820.80 : x
  2. Step 2: Convert to fraction form
    209,961.60/314,985.60 = 69,820.80/x
  3. Step 3: Cross multiply
    209,961.60x = 314,985.60 × 69,820.80
  4. Step 4: Simplify right side
    209,961.60x = 21,992,546,580.48
  5. Step 5: Solve for x
    x = 21,992,546,580.48/209,961.60
  6. Step 6: Final answer
    x = 104,745.57

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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.