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Finding the Fourth Proportional to 7,978, 11,009.64 and 4,666

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Solution

The fourth proportional to 7,978, 11,009.64 and 4,666 is: 6,439.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,978 : 11,009.64 = 4,666 : x
  2. Step 2: Convert to fraction form
    7,978/11,009.64 = 4,666/x
  3. Step 3: Cross multiply
    7,978x = 11,009.64 × 4,666
  4. Step 4: Simplify right side
    7,978x = 51,370,980.24
  5. Step 5: Solve for x
    x = 51,370,980.24/7,978
  6. Step 6: Final answer
    x = 6,439.08

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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.