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Finding the Fourth Proportional to 642,078.80, 962,891.40 and 221,256.80

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Solution

The fourth proportional to 642,078.80, 962,891.40 and 221,256.80 is: 331,807.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,078.80 : 962,891.40 = 221,256.80 : x
  2. Step 2: Convert to fraction form
    642,078.80/962,891.40 = 221,256.80/x
  3. Step 3: Cross multiply
    642,078.80x = 962,891.40 × 221,256.80
  4. Step 4: Simplify right side
    642,078.80x = 213,046,269,911.52
  5. Step 5: Solve for x
    x = 213,046,269,911.52/642,078.80
  6. Step 6: Final answer
    x = 331,807.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.