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Finding the Fourth Proportional to 427,550.90, 640,925.40 and 161,490.20

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Solution

The fourth proportional to 427,550.90, 640,925.40 and 161,490.20 is: 242,083.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,550.90 : 640,925.40 = 161,490.20 : x
  2. Step 2: Convert to fraction form
    427,550.90/640,925.40 = 161,490.20/x
  3. Step 3: Cross multiply
    427,550.90x = 640,925.40 × 161,490.20
  4. Step 4: Simplify right side
    427,550.90x = 103,503,171,031.08
  5. Step 5: Solve for x
    x = 103,503,171,031.08/427,550.90
  6. Step 6: Final answer
    x = 242,083.86

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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.