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Finding the Fourth Proportional to 395,137,531, 545,289,792.78 and 221,297,275

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Solution

The fourth proportional to 395,137,531, 545,289,792.78 and 221,297,275 is: 305,390,239.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    395,137,531 : 545,289,792.78 = 221,297,275 : x
  2. Step 2: Convert to fraction form
    395,137,531/545,289,792.78 = 221,297,275/x
  3. Step 3: Cross multiply
    395,137,531x = 545,289,792.78 × 221,297,275
  4. Step 4: Simplify right side
    395,137,531x = 120,671,145,227,528,672
  5. Step 5: Solve for x
    x = 120,671,145,227,528,672/395,137,531
  6. Step 6: Final answer
    x = 305,390,239.50

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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.