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Finding the Fourth Proportional to 643,653.18, 888,251.13 and 357,191.82

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Solution

The fourth proportional to 643,653.18, 888,251.13 and 357,191.82 is: 492,930.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,653.18 : 888,251.13 = 357,191.82 : x
  2. Step 2: Convert to fraction form
    643,653.18/888,251.13 = 357,191.82/x
  3. Step 3: Cross multiply
    643,653.18x = 888,251.13 × 357,191.82
  4. Step 4: Simplify right side
    643,653.18x = 317,276,037,741.76
  5. Step 5: Solve for x
    x = 317,276,037,741.76/643,653.18
  6. Step 6: Final answer
    x = 492,930.12

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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.