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Finding the Fourth Proportional to 425,693,138.40, 638,539,707.60 and 425,693,138.40

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Solution

The fourth proportional to 425,693,138.40, 638,539,707.60 and 425,693,138.40 is: 638,539,707.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,693,138.40 : 638,539,707.60 = 425,693,138.40 : x
  2. Step 2: Convert to fraction form
    425,693,138.40/638,539,707.60 = 425,693,138.40/x
  3. Step 3: Cross multiply
    425,693,138.40x = 638,539,707.60 × 425,693,138.40
  4. Step 4: Simplify right side
    425,693,138.40x = 271,821,972,121,262,336
  5. Step 5: Solve for x
    x = 271,821,972,121,262,336/425,693,138.40
  6. Step 6: Final answer
    x = 638,539,707.60

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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.