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Finding the Fourth Proportional to 427,721.63, 641,290.84 and 216,953.15

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Solution

The fourth proportional to 427,721.63, 641,290.84 and 216,953.15 is: 325,281.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,721.63 : 641,290.84 = 216,953.15 : x
  2. Step 2: Convert to fraction form
    427,721.63/641,290.84 = 216,953.15/x
  3. Step 3: Cross multiply
    427,721.63x = 641,290.84 × 216,953.15
  4. Step 4: Simplify right side
    427,721.63x = 139,130,067,804.15
  5. Step 5: Solve for x
    x = 139,130,067,804.15/427,721.63
  6. Step 6: Final answer
    x = 325,281.81

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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.