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Finding the Fourth Proportional to 212,892.60, 318,878.10 and 129,948.60

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Solution

The fourth proportional to 212,892.60, 318,878.10 and 129,948.60 is: 194,641.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,892.60 : 318,878.10 = 129,948.60 : x
  2. Step 2: Convert to fraction form
    212,892.60/318,878.10 = 129,948.60/x
  3. Step 3: Cross multiply
    212,892.60x = 318,878.10 × 129,948.60
  4. Step 4: Simplify right side
    212,892.60x = 41,437,762,665.66
  5. Step 5: Solve for x
    x = 41,437,762,665.66/212,892.60
  6. Step 6: Final answer
    x = 194,641.63

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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.