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Finding the Fourth Proportional to 128,468.30, 192,702.45 and 54,586.70

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Solution

The fourth proportional to 128,468.30, 192,702.45 and 54,586.70 is: 81,880.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,468.30 : 192,702.45 = 54,586.70 : x
  2. Step 2: Convert to fraction form
    128,468.30/192,702.45 = 54,586.70/x
  3. Step 3: Cross multiply
    128,468.30x = 192,702.45 × 54,586.70
  4. Step 4: Simplify right side
    128,468.30x = 10,518,990,827.42
  5. Step 5: Solve for x
    x = 10,518,990,827.42/128,468.30
  6. Step 6: Final answer
    x = 81,880.05

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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.