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Finding the Fourth Proportional to 128,280.78, 192,460.05 and 61,702.02

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Solution

The fourth proportional to 128,280.78, 192,460.05 and 61,702.02 is: 92,571.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,280.78 : 192,460.05 = 61,702.02 : x
  2. Step 2: Convert to fraction form
    128,280.78/192,460.05 = 61,702.02/x
  3. Step 3: Cross multiply
    128,280.78x = 192,460.05 × 61,702.02
  4. Step 4: Simplify right side
    128,280.78x = 11,875,173,854.30
  5. Step 5: Solve for x
    x = 11,875,173,854.30/128,280.78
  6. Step 6: Final answer
    x = 92,571.73

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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.