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Finding the Fourth Proportional to 643,886.12, 888,518.38 and 357,383.66

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Solution

The fourth proportional to 643,886.12, 888,518.38 and 357,383.66 is: 493,164.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,886.12 : 888,518.38 = 357,383.66 : x
  2. Step 2: Convert to fraction form
    643,886.12/888,518.38 = 357,383.66/x
  3. Step 3: Cross multiply
    643,886.12x = 888,518.38 × 357,383.66
  4. Step 4: Simplify right side
    643,886.12x = 317,541,950,621.67
  5. Step 5: Solve for x
    x = 317,541,950,621.67/643,886.12
  6. Step 6: Final answer
    x = 493,164.77

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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.