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Finding the Fourth Proportional to 128,608.76, 192,913.16 and 53,688.02

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Solution

The fourth proportional to 128,608.76, 192,913.16 and 53,688.02 is: 80,532.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,608.76 : 192,913.16 = 53,688.02 : x
  2. Step 2: Convert to fraction form
    128,608.76/192,913.16 = 53,688.02/x
  3. Step 3: Cross multiply
    128,608.76x = 192,913.16 × 53,688.02
  4. Step 4: Simplify right side
    128,608.76x = 10,357,125,592.34
  5. Step 5: Solve for x
    x = 10,357,125,592.34/128,608.76
  6. Step 6: Final answer
    x = 80,532.04

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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.