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Finding the Fourth Proportional to 212,986.48, 319,386.44 and 79,773.28

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Solution

The fourth proportional to 212,986.48, 319,386.44 and 79,773.28 is: 119,624.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,986.48 : 319,386.44 = 79,773.28 : x
  2. Step 2: Convert to fraction form
    212,986.48/319,386.44 = 79,773.28/x
  3. Step 3: Cross multiply
    212,986.48x = 319,386.44 × 79,773.28
  4. Step 4: Simplify right side
    212,986.48x = 25,478,503,906.32
  5. Step 5: Solve for x
    x = 25,478,503,906.32/212,986.48
  6. Step 6: Final answer
    x = 119,624.98

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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.