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Finding the Fourth Proportional to 640,963,478.80, 961,445,218.20 and 419,033,717.20

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Solution

The fourth proportional to 640,963,478.80, 961,445,218.20 and 419,033,717.20 is: 628,550,575.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,963,478.80 : 961,445,218.20 = 419,033,717.20 : x
  2. Step 2: Convert to fraction form
    640,963,478.80/961,445,218.20 = 419,033,717.20/x
  3. Step 3: Cross multiply
    640,963,478.80x = 961,445,218.20 × 419,033,717.20
  4. Step 4: Simplify right side
    640,963,478.80x = 402,877,963,666,511,104
  5. Step 5: Solve for x
    x = 402,877,963,666,511,104/640,963,478.80
  6. Step 6: Final answer
    x = 628,550,575.80

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1.5x scale

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.