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Finding the Fourth Proportional to 1,392.35, 2,088.81 and 774.77

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Solution

The fourth proportional to 1,392.35, 2,088.81 and 774.77 is: 1,162.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.35 : 2,088.81 = 774.77 : x
  2. Step 2: Convert to fraction form
    1,392.35/2,088.81 = 774.77/x
  3. Step 3: Cross multiply
    1,392.35x = 2,088.81 × 774.77
  4. Step 4: Simplify right side
    1,392.35x = 1,618,336.88
  5. Step 5: Solve for x
    x = 1,618,336.88/1,392.35
  6. Step 6: Final answer
    x = 1,162.31

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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.