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Finding the Fourth Proportional to 212,459.82, 318,690.51 and 79,338.66

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Solution

The fourth proportional to 212,459.82, 318,690.51 and 79,338.66 is: 119,008.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,459.82 : 318,690.51 = 79,338.66 : x
  2. Step 2: Convert to fraction form
    212,459.82/318,690.51 = 79,338.66/x
  3. Step 3: Cross multiply
    212,459.82x = 318,690.51 × 79,338.66
  4. Step 4: Simplify right side
    212,459.82x = 25,284,478,018.12
  5. Step 5: Solve for x
    x = 25,284,478,018.12/212,459.82
  6. Step 6: Final answer
    x = 119,008.28

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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.