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Finding the Fourth Proportional to 212,779.78, 319,242.57 and 72,636.82

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Solution

The fourth proportional to 212,779.78, 319,242.57 and 72,636.82 is: 108,980.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,779.78 : 319,242.57 = 72,636.82 : x
  2. Step 2: Convert to fraction form
    212,779.78/319,242.57 = 72,636.82/x
  3. Step 3: Cross multiply
    212,779.78x = 319,242.57 × 72,636.82
  4. Step 4: Simplify right side
    212,779.78x = 23,188,765,093.43
  5. Step 5: Solve for x
    x = 23,188,765,093.43/212,779.78
  6. Step 6: Final answer
    x = 108,980.12

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1.5x scale

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.