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Finding the Fourth Proportional to 1,393.62, 1,921.92 and 1,207.02

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Solution

The fourth proportional to 1,393.62, 1,921.92 and 1,207.02 is: 1,664.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.62 : 1,921.92 = 1,207.02 : x
  2. Step 2: Convert to fraction form
    1,393.62/1,921.92 = 1,207.02/x
  3. Step 3: Cross multiply
    1,393.62x = 1,921.92 × 1,207.02
  4. Step 4: Simplify right side
    1,393.62x = 2,319,795.88
  5. Step 5: Solve for x
    x = 2,319,795.88/1,393.62
  6. Step 6: Final answer
    x = 1,664.58

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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.