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Finding the Fourth Proportional to 98,915.91, 136,428.64 and 85,141.69

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Solution

The fourth proportional to 98,915.91, 136,428.64 and 85,141.69 is: 117,430.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,915.91 : 136,428.64 = 85,141.69 : x
  2. Step 2: Convert to fraction form
    98,915.91/136,428.64 = 85,141.69/x
  3. Step 3: Cross multiply
    98,915.91x = 136,428.64 × 85,141.69
  4. Step 4: Simplify right side
    98,915.91x = 11,615,764,974.00
  5. Step 5: Solve for x
    x = 11,615,764,974.00/98,915.91
  6. Step 6: Final answer
    x = 117,430.70

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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.