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Finding the Fourth Proportional to 103,711.40, 155,307.90 and 68,460.20

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Solution

The fourth proportional to 103,711.40, 155,307.90 and 68,460.20 is: 102,519.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,711.40 : 155,307.90 = 68,460.20 : x
  2. Step 2: Convert to fraction form
    103,711.40/155,307.90 = 68,460.20/x
  3. Step 3: Cross multiply
    103,711.40x = 155,307.90 × 68,460.20
  4. Step 4: Simplify right side
    103,711.40x = 10,632,409,895.58
  5. Step 5: Solve for x
    x = 10,632,409,895.58/103,711.40
  6. Step 6: Final answer
    x = 102,519.20

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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.