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Finding the Fourth Proportional to 390,877.85, 539,413.43 and 221,108.33

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Solution

The fourth proportional to 390,877.85, 539,413.43 and 221,108.33 is: 305,130.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,877.85 : 539,413.43 = 221,108.33 : x
  2. Step 2: Convert to fraction form
    390,877.85/539,413.43 = 221,108.33/x
  3. Step 3: Cross multiply
    390,877.85x = 539,413.43 × 221,108.33
  4. Step 4: Simplify right side
    390,877.85x = 119,268,798,884.26
  5. Step 5: Solve for x
    x = 119,268,798,884.26/390,877.85
  6. Step 6: Final answer
    x = 305,130.62

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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.