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Finding the Fourth Proportional to 103,660.79, 155,285.47 and 79,885.82

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Solution

The fourth proportional to 103,660.79, 155,285.47 and 79,885.82 is: 119,670.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,660.79 : 155,285.47 = 79,885.82 : x
  2. Step 2: Convert to fraction form
    103,660.79/155,285.47 = 79,885.82/x
  3. Step 3: Cross multiply
    103,660.79x = 155,285.47 × 79,885.82
  4. Step 4: Simplify right side
    103,660.79x = 12,405,107,105.04
  5. Step 5: Solve for x
    x = 12,405,107,105.04/103,660.79
  6. Step 6: Final answer
    x = 119,670.20

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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.