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Finding the Fourth Proportional to 312,391.17, 468,211.17 and 143,679

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Solution

The fourth proportional to 312,391.17, 468,211.17 and 143,679 is: 215,345.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,391.17 : 468,211.17 = 143,679 : x
  2. Step 2: Convert to fraction form
    312,391.17/468,211.17 = 143,679/x
  3. Step 3: Cross multiply
    312,391.17x = 468,211.17 × 143,679
  4. Step 4: Simplify right side
    312,391.17x = 67,272,112,694.43
  5. Step 5: Solve for x
    x = 67,272,112,694.43/312,391.17
  6. Step 6: Final answer
    x = 215,345.76

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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.