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Finding the Fourth Proportional to 221,238,127.20, 309,159,421.80 and 221,238,127.20

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Solution

The fourth proportional to 221,238,127.20, 309,159,421.80 and 221,238,127.20 is: 309,159,421.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,238,127.20 : 309,159,421.80 = 221,238,127.20 : x
  2. Step 2: Convert to fraction form
    221,238,127.20/309,159,421.80 = 221,238,127.20/x
  3. Step 3: Cross multiply
    221,238,127.20x = 309,159,421.80 × 221,238,127.20
  4. Step 4: Simplify right side
    221,238,127.20x = 68,397,851,485,266,848
  5. Step 5: Solve for x
    x = 68,397,851,485,266,848/221,238,127.20
  6. Step 6: Final answer
    x = 309,159,421.80

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.