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Finding the Fourth Proportional to 128,806.55, 193,210.32 and 53,874.13

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Solution

The fourth proportional to 128,806.55, 193,210.32 and 53,874.13 is: 80,811.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,806.55 : 193,210.32 = 53,874.13 : x
  2. Step 2: Convert to fraction form
    128,806.55/193,210.32 = 53,874.13/x
  3. Step 3: Cross multiply
    128,806.55x = 193,210.32 × 53,874.13
  4. Step 4: Simplify right side
    128,806.55x = 10,409,038,205.92
  5. Step 5: Solve for x
    x = 10,409,038,205.92/128,806.55
  6. Step 6: Final answer
    x = 80,811.40

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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.