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Finding the Fourth Proportional to 388,968,855.84, 536,770,712.88 and 212,755,309.74

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Solution

The fourth proportional to 388,968,855.84, 536,770,712.88 and 212,755,309.74 is: 293,598,877.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,968,855.84 : 536,770,712.88 = 212,755,309.74 : x
  2. Step 2: Convert to fraction form
    388,968,855.84/536,770,712.88 = 212,755,309.74/x
  3. Step 3: Cross multiply
    388,968,855.84x = 536,770,712.88 × 212,755,309.74
  4. Step 4: Simplify right side
    388,968,855.84x = 114,200,819,278,145,008
  5. Step 5: Solve for x
    x = 114,200,819,278,145,008/388,968,855.84
  6. Step 6: Final answer
    x = 293,598,877.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.