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Finding the Fourth Proportional to 98,749.70, 136,236.53 and 68,519.90

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Solution

The fourth proportional to 98,749.70, 136,236.53 and 68,519.90 is: 94,531.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,749.70 : 136,236.53 = 68,519.90 : x
  2. Step 2: Convert to fraction form
    98,749.70/136,236.53 = 68,519.90/x
  3. Step 3: Cross multiply
    98,749.70x = 136,236.53 × 68,519.90
  4. Step 4: Simplify right side
    98,749.70x = 9,334,912,730.76
  5. Step 5: Solve for x
    x = 9,334,912,730.76/98,749.70
  6. Step 6: Final answer
    x = 94,531.05

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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.