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Finding the Fourth Proportional to 121,413.90, 181,926.45 and 79,812.30

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Solution

The fourth proportional to 121,413.90, 181,926.45 and 79,812.30 is: 119,590.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,413.90 : 181,926.45 = 79,812.30 : x
  2. Step 2: Convert to fraction form
    121,413.90/181,926.45 = 79,812.30/x
  3. Step 3: Cross multiply
    121,413.90x = 181,926.45 × 79,812.30
  4. Step 4: Simplify right side
    121,413.90x = 14,519,968,405.34
  5. Step 5: Solve for x
    x = 14,519,968,405.34/121,413.90
  6. Step 6: Final answer
    x = 119,590.66

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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.