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Finding the Fourth Proportional to 3,978.88, 5,968.32 and 1,242.88

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Solution

The fourth proportional to 3,978.88, 5,968.32 and 1,242.88 is: 1,864.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978.88 : 5,968.32 = 1,242.88 : x
  2. Step 2: Convert to fraction form
    3,978.88/5,968.32 = 1,242.88/x
  3. Step 3: Cross multiply
    3,978.88x = 5,968.32 × 1,242.88
  4. Step 4: Simplify right side
    3,978.88x = 7,417,869.51
  5. Step 5: Solve for x
    x = 7,417,869.51/3,978.88
  6. Step 6: Final answer
    x = 1,864.31

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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.