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Finding the Fourth Proportional to 103,809.60, 155,617.20 and 81,307.80

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Solution

The fourth proportional to 103,809.60, 155,617.20 and 81,307.80 is: 121,885.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,809.60 : 155,617.20 = 81,307.80 : x
  2. Step 2: Convert to fraction form
    103,809.60/155,617.20 = 81,307.80/x
  3. Step 3: Cross multiply
    103,809.60x = 155,617.20 × 81,307.80
  4. Step 4: Simplify right side
    103,809.60x = 12,652,892,174.16
  5. Step 5: Solve for x
    x = 12,652,892,174.16/103,809.60
  6. Step 6: Final answer
    x = 121,885.57

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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.