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Finding the Fourth Proportional to 640,987,220.40, 962,488,600.20 and 368,889,428.40

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Solution

The fourth proportional to 640,987,220.40, 962,488,600.20 and 368,889,428.40 is: 553,914,116.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,987,220.40 : 962,488,600.20 = 368,889,428.40 : x
  2. Step 2: Convert to fraction form
    640,987,220.40/962,488,600.20 = 368,889,428.40/x
  3. Step 3: Cross multiply
    640,987,220.40x = 962,488,600.20 × 368,889,428.40
  4. Step 4: Simplify right side
    640,987,220.40x = 355,051,869,569,294,144
  5. Step 5: Solve for x
    x = 355,051,869,569,294,144/640,987,220.40
  6. Step 6: Final answer
    x = 553,914,116.02

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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.