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Finding the Fourth Proportional to 1,929.86, 2,894.12 and 631

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Solution

The fourth proportional to 1,929.86, 2,894.12 and 631 is: 946.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,929.86 : 2,894.12 = 631 : x
  2. Step 2: Convert to fraction form
    1,929.86/2,894.12 = 631/x
  3. Step 3: Cross multiply
    1,929.86x = 2,894.12 × 631
  4. Step 4: Simplify right side
    1,929.86x = 1,826,189.72
  5. Step 5: Solve for x
    x = 1,826,189.72/1,929.86
  6. Step 6: Final answer
    x = 946.28

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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.