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Finding the Fourth Proportional to 103,145.40, 154,718.10 and 40,815.90

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Solution

The fourth proportional to 103,145.40, 154,718.10 and 40,815.90 is: 61,223.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,145.40 : 154,718.10 = 40,815.90 : x
  2. Step 2: Convert to fraction form
    103,145.40/154,718.10 = 40,815.90/x
  3. Step 3: Cross multiply
    103,145.40x = 154,718.10 × 40,815.90
  4. Step 4: Simplify right side
    103,145.40x = 6,314,958,497.79
  5. Step 5: Solve for x
    x = 6,314,958,497.79/103,145.40
  6. Step 6: Final answer
    x = 61,223.85

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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.