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Finding the Fourth Proportional to 106,390.40, 159,715.20 and 105,612.80

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Solution

The fourth proportional to 106,390.40, 159,715.20 and 105,612.80 is: 158,547.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    106,390.40 : 159,715.20 = 105,612.80 : x
  2. Step 2: Convert to fraction form
    106,390.40/159,715.20 = 105,612.80/x
  3. Step 3: Cross multiply
    106,390.40x = 159,715.20 × 105,612.80
  4. Step 4: Simplify right side
    106,390.40x = 16,867,969,474.56
  5. Step 5: Solve for x
    x = 16,867,969,474.56/106,390.40
  6. Step 6: Final answer
    x = 158,547.85

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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.