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Finding the Fourth Proportional to 1,929.28, 2,894.04 and 775

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Solution

The fourth proportional to 1,929.28, 2,894.04 and 775 is: 1,162.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,929.28 : 2,894.04 = 775 : x
  2. Step 2: Convert to fraction form
    1,929.28/2,894.04 = 775/x
  3. Step 3: Cross multiply
    1,929.28x = 2,894.04 × 775
  4. Step 4: Simplify right side
    1,929.28x = 2,242,881
  5. Step 5: Solve for x
    x = 2,242,881/1,929.28
  6. Step 6: Final answer
    x = 1,162.55

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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.