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Finding the Fourth Proportional to 390,793.93, 539,305.29 and 218,710.54

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Solution

The fourth proportional to 390,793.93, 539,305.29 and 218,710.54 is: 301,825.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,793.93 : 539,305.29 = 218,710.54 : x
  2. Step 2: Convert to fraction form
    390,793.93/539,305.29 = 218,710.54/x
  3. Step 3: Cross multiply
    390,793.93x = 539,305.29 × 218,710.54
  4. Step 4: Simplify right side
    390,793.93x = 117,951,751,200.76
  5. Step 5: Solve for x
    x = 117,951,751,200.76/390,793.93
  6. Step 6: Final answer
    x = 301,825.96

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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.