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Finding the Fourth Proportional to 212,643.78, 318,998.01 and 72,369.60

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Solution

The fourth proportional to 212,643.78, 318,998.01 and 72,369.60 is: 108,565.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,643.78 : 318,998.01 = 72,369.60 : x
  2. Step 2: Convert to fraction form
    212,643.78/318,998.01 = 72,369.60/x
  3. Step 3: Cross multiply
    212,643.78x = 318,998.01 × 72,369.60
  4. Step 4: Simplify right side
    212,643.78x = 23,085,758,384.50
  5. Step 5: Solve for x
    x = 23,085,758,384.50/212,643.78
  6. Step 6: Final answer
    x = 108,565.41

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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.