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Finding the Fourth Proportional to 426,989,801.70, 640,484,702.55 and 393,733,404.90

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Solution

The fourth proportional to 426,989,801.70, 640,484,702.55 and 393,733,404.90 is: 590,600,107.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,989,801.70 : 640,484,702.55 = 393,733,404.90 : x
  2. Step 2: Convert to fraction form
    426,989,801.70/640,484,702.55 = 393,733,404.90/x
  3. Step 3: Cross multiply
    426,989,801.70x = 640,484,702.55 × 393,733,404.90
  4. Step 4: Simplify right side
    426,989,801.70x = 252,180,222,721,375,168
  5. Step 5: Solve for x
    x = 252,180,222,721,375,168/426,989,801.70
  6. Step 6: Final answer
    x = 590,600,107.35

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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.