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Finding the Fourth Proportional to 212,571,858.30, 318,353,902.65 and 212,571,858.30

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Solution

The fourth proportional to 212,571,858.30, 318,353,902.65 and 212,571,858.30 is: 318,353,902.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,571,858.30 : 318,353,902.65 = 212,571,858.30 : x
  2. Step 2: Convert to fraction form
    212,571,858.30/318,353,902.65 = 212,571,858.30/x
  3. Step 3: Cross multiply
    212,571,858.30x = 318,353,902.65 × 212,571,858.30
  4. Step 4: Simplify right side
    212,571,858.30x = 67,673,080,683,367,792
  5. Step 5: Solve for x
    x = 67,673,080,683,367,792/212,571,858.30
  6. Step 6: Final answer
    x = 318,353,902.65

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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.