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Finding the Fourth Proportional to 128,443.52, 192,490.20 and 61,878.80

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Solution

The fourth proportional to 128,443.52, 192,490.20 and 61,878.80 is: 92,733.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,443.52 : 192,490.20 = 61,878.80 : x
  2. Step 2: Convert to fraction form
    128,443.52/192,490.20 = 61,878.80/x
  3. Step 3: Cross multiply
    128,443.52x = 192,490.20 × 61,878.80
  4. Step 4: Simplify right side
    128,443.52x = 11,911,062,587.76
  5. Step 5: Solve for x
    x = 11,911,062,587.76/128,443.52
  6. Step 6: Final answer
    x = 92,733.85

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1.5x scale

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.