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Finding the Fourth Proportional to 643,811.72, 888,453.46 and 357,334.28

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Solution

The fourth proportional to 643,811.72, 888,453.46 and 357,334.28 is: 493,117.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,811.72 : 888,453.46 = 357,334.28 : x
  2. Step 2: Convert to fraction form
    643,811.72/888,453.46 = 357,334.28/x
  3. Step 3: Cross multiply
    643,811.72x = 888,453.46 × 357,334.28
  4. Step 4: Simplify right side
    643,811.72x = 317,474,877,442.61
  5. Step 5: Solve for x
    x = 317,474,877,442.61/643,811.72
  6. Step 6: Final answer
    x = 493,117.58

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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.