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Finding the Fourth Proportional to 640,987,217.40, 962,488,595.70 and 368,889,425.40

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Solution

The fourth proportional to 640,987,217.40, 962,488,595.70 and 368,889,425.40 is: 553,914,111.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,987,217.40 : 962,488,595.70 = 368,889,425.40 : x
  2. Step 2: Convert to fraction form
    640,987,217.40/962,488,595.70 = 368,889,425.40/x
  3. Step 3: Cross multiply
    640,987,217.40x = 962,488,595.70 × 368,889,425.40
  4. Step 4: Simplify right side
    640,987,217.40x = 355,051,865,021,825,920
  5. Step 5: Solve for x
    x = 355,051,865,021,825,920/640,987,217.40
  6. Step 6: Final answer
    x = 553,914,111.52

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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.