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Finding the Fourth Proportional to 103,312.40, 154,709.40 and 68,061.20

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Solution

The fourth proportional to 103,312.40, 154,709.40 and 68,061.20 is: 101,921.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,312.40 : 154,709.40 = 68,061.20 : x
  2. Step 2: Convert to fraction form
    103,312.40/154,709.40 = 68,061.20/x
  3. Step 3: Cross multiply
    103,312.40x = 154,709.40 × 68,061.20
  4. Step 4: Simplify right side
    103,312.40x = 10,529,707,415.28
  5. Step 5: Solve for x
    x = 10,529,707,415.28/103,312.40
  6. Step 6: Final answer
    x = 101,921.04

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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.