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Finding the Fourth Proportional to 99,670.72, 149,506.08 and 68,411.20

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Solution

The fourth proportional to 99,670.72, 149,506.08 and 68,411.20 is: 102,616.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,670.72 : 149,506.08 = 68,411.20 : x
  2. Step 2: Convert to fraction form
    99,670.72/149,506.08 = 68,411.20/x
  3. Step 3: Cross multiply
    99,670.72x = 149,506.08 × 68,411.20
  4. Step 4: Simplify right side
    99,670.72x = 10,227,889,709.79
  5. Step 5: Solve for x
    x = 10,227,889,709.79/99,670.72
  6. Step 6: Final answer
    x = 102,616.80

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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.