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Finding the Fourth Proportional to 103,672.78, 155,320.53 and 72,015.96

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Solution

The fourth proportional to 103,672.78, 155,320.53 and 72,015.96 is: 107,892.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,672.78 : 155,320.53 = 72,015.96 : x
  2. Step 2: Convert to fraction form
    103,672.78/155,320.53 = 72,015.96/x
  3. Step 3: Cross multiply
    103,672.78x = 155,320.53 × 72,015.96
  4. Step 4: Simplify right side
    103,672.78x = 11,185,557,075.66
  5. Step 5: Solve for x
    x = 11,185,557,075.66/103,672.78
  6. Step 6: Final answer
    x = 107,892.90

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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.