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Finding the Fourth Proportional to 98,995.02, 136,480.97 and 78,644.61

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Solution

The fourth proportional to 98,995.02, 136,480.97 and 78,644.61 is: 108,424.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,995.02 : 136,480.97 = 78,644.61 : x
  2. Step 2: Convert to fraction form
    98,995.02/136,480.97 = 78,644.61/x
  3. Step 3: Cross multiply
    98,995.02x = 136,480.97 × 78,644.61
  4. Step 4: Simplify right side
    98,995.02x = 10,733,492,264.85
  5. Step 5: Solve for x
    x = 10,733,492,264.85/98,995.02
  6. Step 6: Final answer
    x = 108,424.57

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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.