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Finding the Fourth Proportional to 643,190.40, 887,657.28 and 356,802.78

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Solution

The fourth proportional to 643,190.40, 887,657.28 and 356,802.78 is: 492,418.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,190.40 : 887,657.28 = 356,802.78 : x
  2. Step 2: Convert to fraction form
    643,190.40/887,657.28 = 356,802.78/x
  3. Step 3: Cross multiply
    643,190.40x = 887,657.28 × 356,802.78
  4. Step 4: Simplify right side
    643,190.40x = 316,718,585,191.24
  5. Step 5: Solve for x
    x = 316,718,585,191.24/643,190.40
  6. Step 6: Final answer
    x = 492,418.09

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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.