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Finding the Fourth Proportional to 315,518.82, 435,413.79 and 172,278.78

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Solution

The fourth proportional to 315,518.82, 435,413.79 and 172,278.78 is: 237,743.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,518.82 : 435,413.79 = 172,278.78 : x
  2. Step 2: Convert to fraction form
    315,518.82/435,413.79 = 172,278.78/x
  3. Step 3: Cross multiply
    315,518.82x = 435,413.79 × 172,278.78
  4. Step 4: Simplify right side
    315,518.82x = 75,012,556,536.38
  5. Step 5: Solve for x
    x = 75,012,556,536.38/315,518.82
  6. Step 6: Final answer
    x = 237,743.53

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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.