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Finding the Fourth Proportional to 643,843.84, 888,490.80 and 357,346.72

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Solution

The fourth proportional to 643,843.84, 888,490.80 and 357,346.72 is: 493,130.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,843.84 : 888,490.80 = 357,346.72 : x
  2. Step 2: Convert to fraction form
    643,843.84/888,490.80 = 357,346.72/x
  3. Step 3: Cross multiply
    643,843.84x = 888,490.80 × 357,346.72
  4. Step 4: Simplify right side
    643,843.84x = 317,499,273,130.18
  5. Step 5: Solve for x
    x = 317,499,273,130.18/643,843.84
  6. Step 6: Final answer
    x = 493,130.87

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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.