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Finding the Fourth Proportional to 99,240.56, 136,872.74 and 65,284

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Solution

The fourth proportional to 99,240.56, 136,872.74 and 65,284 is: 90,039.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,240.56 : 136,872.74 = 65,284 : x
  2. Step 2: Convert to fraction form
    99,240.56/136,872.74 = 65,284/x
  3. Step 3: Cross multiply
    99,240.56x = 136,872.74 × 65,284
  4. Step 4: Simplify right side
    99,240.56x = 8,935,599,958.16
  5. Step 5: Solve for x
    x = 8,935,599,958.16/99,240.56
  6. Step 6: Final answer
    x = 90,039.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.