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Finding the Fourth Proportional to 1,392.93, 1,921.91 and 771.93

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Solution

The fourth proportional to 1,392.93, 1,921.91 and 771.93 is: 1,065.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.93 : 1,921.91 = 771.93 : x
  2. Step 2: Convert to fraction form
    1,392.93/1,921.91 = 771.93/x
  3. Step 3: Cross multiply
    1,392.93x = 1,921.91 × 771.93
  4. Step 4: Simplify right side
    1,392.93x = 1,483,576.13
  5. Step 5: Solve for x
    x = 1,483,576.13/1,392.93
  6. Step 6: Final answer
    x = 1,065.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.