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Finding the Fourth Proportional to 243,721.20, 365,581.80 and 212,617.20

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Solution

The fourth proportional to 243,721.20, 365,581.80 and 212,617.20 is: 318,925.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    243,721.20 : 365,581.80 = 212,617.20 : x
  2. Step 2: Convert to fraction form
    243,721.20/365,581.80 = 212,617.20/x
  3. Step 3: Cross multiply
    243,721.20x = 365,581.80 × 212,617.20
  4. Step 4: Simplify right side
    243,721.20x = 77,728,978,686.96
  5. Step 5: Solve for x
    x = 77,728,978,686.96/243,721.20
  6. Step 6: Final answer
    x = 318,925.80

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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.