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Finding the Fourth Proportional to 643,509.22, 888,148.70 and 357,121.58

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Solution

The fourth proportional to 643,509.22, 888,148.70 and 357,121.58 is: 492,886.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,509.22 : 888,148.70 = 357,121.58 : x
  2. Step 2: Convert to fraction form
    643,509.22/888,148.70 = 357,121.58/x
  3. Step 3: Cross multiply
    643,509.22x = 888,148.70 × 357,121.58
  4. Step 4: Simplify right side
    643,509.22x = 317,177,067,018.95
  5. Step 5: Solve for x
    x = 317,177,067,018.95/643,509.22
  6. Step 6: Final answer
    x = 492,886.59

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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.