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Finding the Fourth Proportional to 642,803.80, 887,063.28 and 352,431.50

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Solution

The fourth proportional to 642,803.80, 887,063.28 and 352,431.50 is: 486,352.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,803.80 : 887,063.28 = 352,431.50 : x
  2. Step 2: Convert to fraction form
    642,803.80/887,063.28 = 352,431.50/x
  3. Step 3: Cross multiply
    642,803.80x = 887,063.28 × 352,431.50
  4. Step 4: Simplify right side
    642,803.80x = 312,629,042,365.32
  5. Step 5: Solve for x
    x = 312,629,042,365.32/642,803.80
  6. Step 6: Final answer
    x = 486,352.20

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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.