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Finding the Fourth Proportional to 128,594.72, 192,814.32 and 86,915.36

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Solution

The fourth proportional to 128,594.72, 192,814.32 and 86,915.36 is: 130,320.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,594.72 : 192,814.32 = 86,915.36 : x
  2. Step 2: Convert to fraction form
    128,594.72/192,814.32 = 86,915.36/x
  3. Step 3: Cross multiply
    128,594.72x = 192,814.32 × 86,915.36
  4. Step 4: Simplify right side
    128,594.72x = 16,758,526,035.96
  5. Step 5: Solve for x
    x = 16,758,526,035.96/128,594.72
  6. Step 6: Final answer
    x = 130,320.48

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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.