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Finding the Fourth Proportional to 345,873.70, 518,810.55 and 212,320.90

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Solution

The fourth proportional to 345,873.70, 518,810.55 and 212,320.90 is: 318,481.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    345,873.70 : 518,810.55 = 212,320.90 : x
  2. Step 2: Convert to fraction form
    345,873.70/518,810.55 = 212,320.90/x
  3. Step 3: Cross multiply
    345,873.70x = 518,810.55 × 212,320.90
  4. Step 4: Simplify right side
    345,873.70x = 110,154,322,905.50
  5. Step 5: Solve for x
    x = 110,154,322,905.50/345,873.70
  6. Step 6: Final answer
    x = 318,481.35

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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.