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Finding the Fourth Proportional to 427,809.20, 640,791.26 and 402,656.58

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Solution

The fourth proportional to 427,809.20, 640,791.26 and 402,656.58 is: 603,116.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,809.20 : 640,791.26 = 402,656.58 : x
  2. Step 2: Convert to fraction form
    427,809.20/640,791.26 = 402,656.58/x
  3. Step 3: Cross multiply
    427,809.20x = 640,791.26 × 402,656.58
  4. Step 4: Simplify right side
    427,809.20x = 258,018,816,407.29
  5. Step 5: Solve for x
    x = 258,018,816,407.29/427,809.20
  6. Step 6: Final answer
    x = 603,116.56

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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.