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Finding the Fourth Proportional to 388,720.69, 536,413.85 and 218,943.88

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Solution

The fourth proportional to 388,720.69, 536,413.85 and 218,943.88 is: 302,130.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,720.69 : 536,413.85 = 218,943.88 : x
  2. Step 2: Convert to fraction form
    388,720.69/536,413.85 = 218,943.88/x
  3. Step 3: Cross multiply
    388,720.69x = 536,413.85 × 218,943.88
  4. Step 4: Simplify right side
    388,720.69x = 117,444,529,604.74
  5. Step 5: Solve for x
    x = 117,444,529,604.74/388,720.69
  6. Step 6: Final answer
    x = 302,130.89

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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.