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Finding the Fourth Proportional to 103,521.40, 155,282.10 and 72,028.60

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Solution

The fourth proportional to 103,521.40, 155,282.10 and 72,028.60 is: 108,042.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,521.40 : 155,282.10 = 72,028.60 : x
  2. Step 2: Convert to fraction form
    103,521.40/155,282.10 = 72,028.60/x
  3. Step 3: Cross multiply
    103,521.40x = 155,282.10 × 72,028.60
  4. Step 4: Simplify right side
    103,521.40x = 11,184,752,268.06
  5. Step 5: Solve for x
    x = 11,184,752,268.06/103,521.40
  6. Step 6: Final answer
    x = 108,042.90

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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.