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Finding the Fourth Proportional to 390,876.52, 539,418.73 and 218,790.20

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Solution

The fourth proportional to 390,876.52, 539,418.73 and 218,790.20 is: 301,935.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,876.52 : 539,418.73 = 218,790.20 : x
  2. Step 2: Convert to fraction form
    390,876.52/539,418.73 = 218,790.20/x
  3. Step 3: Cross multiply
    390,876.52x = 539,418.73 × 218,790.20
  4. Step 4: Simplify right side
    390,876.52x = 118,019,531,966.02
  5. Step 5: Solve for x
    x = 118,019,531,966.02/390,876.52
  6. Step 6: Final answer
    x = 301,935.59

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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.