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Finding the Fourth Proportional to 128,675.85, 177,567.84 and 71,316.15

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Solution

The fourth proportional to 128,675.85, 177,567.84 and 71,316.15 is: 98,413.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,675.85 : 177,567.84 = 71,316.15 : x
  2. Step 2: Convert to fraction form
    128,675.85/177,567.84 = 71,316.15/x
  3. Step 3: Cross multiply
    128,675.85x = 177,567.84 × 71,316.15
  4. Step 4: Simplify right side
    128,675.85x = 12,663,454,712.62
  5. Step 5: Solve for x
    x = 12,663,454,712.62/128,675.85
  6. Step 6: Final answer
    x = 98,413.61

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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.