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Finding the Fourth Proportional to 128,915.90, 193,373.85 and 97,811.90

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Solution

The fourth proportional to 128,915.90, 193,373.85 and 97,811.90 is: 146,717.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,915.90 : 193,373.85 = 97,811.90 : x
  2. Step 2: Convert to fraction form
    128,915.90/193,373.85 = 97,811.90/x
  3. Step 3: Cross multiply
    128,915.90x = 193,373.85 × 97,811.90
  4. Step 4: Simplify right side
    128,915.90x = 18,914,263,678.82
  5. Step 5: Solve for x
    x = 18,914,263,678.82/128,915.90
  6. Step 6: Final answer
    x = 146,717.85

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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.