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Finding the Fourth Proportional to 128,735.72, 193,156.88 and 69,501.74

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Solution

The fourth proportional to 128,735.72, 193,156.88 and 69,501.74 is: 104,281.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,735.72 : 193,156.88 = 69,501.74 : x
  2. Step 2: Convert to fraction form
    128,735.72/193,156.88 = 69,501.74/x
  3. Step 3: Cross multiply
    128,735.72x = 193,156.88 × 69,501.74
  4. Step 4: Simplify right side
    128,735.72x = 13,424,737,939.68
  5. Step 5: Solve for x
    x = 13,424,737,939.68/128,735.72
  6. Step 6: Final answer
    x = 104,281.38

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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.