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Finding the Fourth Proportional to 128,587.10, 192,893.40 and 53,730.64

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Solution

The fourth proportional to 128,587.10, 192,893.40 and 53,730.64 is: 80,601.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,587.10 : 192,893.40 = 53,730.64 : x
  2. Step 2: Convert to fraction form
    128,587.10/192,893.40 = 53,730.64/x
  3. Step 3: Cross multiply
    128,587.10x = 192,893.40 × 53,730.64
  4. Step 4: Simplify right side
    128,587.10x = 10,364,286,074.89
  5. Step 5: Solve for x
    x = 10,364,286,074.89/128,587.10
  6. Step 6: Final answer
    x = 80,601.29

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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.