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Finding the Fourth Proportional to 210,978,850.17, 316,345,605.12 and 79,831,256.78

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Solution

The fourth proportional to 210,978,850.17, 316,345,605.12 and 79,831,256.78 is: 119,700,468.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,978,850.17 : 316,345,605.12 = 79,831,256.78 : x
  2. Step 2: Convert to fraction form
    210,978,850.17/316,345,605.12 = 79,831,256.78/x
  3. Step 3: Cross multiply
    210,978,850.17x = 316,345,605.12 × 79,831,256.78
  4. Step 4: Simplify right side
    210,978,850.17x = 25,254,267,233,163,772
  5. Step 5: Solve for x
    x = 25,254,267,233,163,772/210,978,850.17
  6. Step 6: Final answer
    x = 119,700,468.61

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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.