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Finding the Fourth Proportional to 128,714.70, 177,626.34 and 78,413.70

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Solution

The fourth proportional to 128,714.70, 177,626.34 and 78,413.70 is: 108,210.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,714.70 : 177,626.34 = 78,413.70 : x
  2. Step 2: Convert to fraction form
    128,714.70/177,626.34 = 78,413.70/x
  3. Step 3: Cross multiply
    128,714.70x = 177,626.34 × 78,413.70
  4. Step 4: Simplify right side
    128,714.70x = 13,928,338,536.86
  5. Step 5: Solve for x
    x = 13,928,338,536.86/128,714.70
  6. Step 6: Final answer
    x = 108,210.94

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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.