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Finding the Fourth Proportional to 399,039.10, 550,685.65 and 217,762.71

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Solution

The fourth proportional to 399,039.10, 550,685.65 and 217,762.71 is: 300,518.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,039.10 : 550,685.65 = 217,762.71 : x
  2. Step 2: Convert to fraction form
    399,039.10/550,685.65 = 217,762.71/x
  3. Step 3: Cross multiply
    399,039.10x = 550,685.65 × 217,762.71
  4. Step 4: Simplify right side
    399,039.10x = 119,918,798,413.30
  5. Step 5: Solve for x
    x = 119,918,798,413.30/399,039.10
  6. Step 6: Final answer
    x = 300,518.92

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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.