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Finding the Fourth Proportional to 640,872,019.40, 961,308,029.10 and 425,461,267.40

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Solution

The fourth proportional to 640,872,019.40, 961,308,029.10 and 425,461,267.40 is: 638,191,901.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,872,019.40 : 961,308,029.10 = 425,461,267.40 : x
  2. Step 2: Convert to fraction form
    640,872,019.40/961,308,029.10 = 425,461,267.40/x
  3. Step 3: Cross multiply
    640,872,019.40x = 961,308,029.10 × 425,461,267.40
  4. Step 4: Simplify right side
    640,872,019.40x = 408,999,332,422,682,048
  5. Step 5: Solve for x
    x = 408,999,332,422,682,048/640,872,019.40
  6. Step 6: Final answer
    x = 638,191,901.10

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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.