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Finding the Fourth Proportional to 129,289.68, 178,413.24 and 72,697.68

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Solution

The fourth proportional to 129,289.68, 178,413.24 and 72,697.68 is: 100,319.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,289.68 : 178,413.24 = 72,697.68 : x
  2. Step 2: Convert to fraction form
    129,289.68/178,413.24 = 72,697.68/x
  3. Step 3: Cross multiply
    129,289.68x = 178,413.24 × 72,697.68
  4. Step 4: Simplify right side
    129,289.68x = 12,970,228,629.28
  5. Step 5: Solve for x
    x = 12,970,228,629.28/129,289.68
  6. Step 6: Final answer
    x = 100,319.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.