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Finding the Fourth Proportional to 643,172.76, 887,556 and 356,719.50

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Solution

The fourth proportional to 643,172.76, 887,556 and 356,719.50 is: 492,260.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,172.76 : 887,556 = 356,719.50 : x
  2. Step 2: Convert to fraction form
    643,172.76/887,556 = 356,719.50/x
  3. Step 3: Cross multiply
    643,172.76x = 887,556 × 356,719.50
  4. Step 4: Simplify right side
    643,172.76x = 316,608,532,542
  5. Step 5: Solve for x
    x = 316,608,532,542/643,172.76
  6. Step 6: Final answer
    x = 492,260.48

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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.