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Finding the Fourth Proportional to 390,709.44, 539,022.60 and 254,862.72

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Solution

The fourth proportional to 390,709.44, 539,022.60 and 254,862.72 is: 351,608.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,709.44 : 539,022.60 = 254,862.72 : x
  2. Step 2: Convert to fraction form
    390,709.44/539,022.60 = 254,862.72/x
  3. Step 3: Cross multiply
    390,709.44x = 539,022.60 × 254,862.72
  4. Step 4: Simplify right side
    390,709.44x = 137,376,765,977.47
  5. Step 5: Solve for x
    x = 137,376,765,977.47/390,709.44
  6. Step 6: Final answer
    x = 351,608.51

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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.