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Finding the Fourth Proportional to 11,985.79, 17,978.84 and 4,590.69

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Solution

The fourth proportional to 11,985.79, 17,978.84 and 4,590.69 is: 6,886.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,985.79 : 17,978.84 = 4,590.69 : x
  2. Step 2: Convert to fraction form
    11,985.79/17,978.84 = 4,590.69/x
  3. Step 3: Cross multiply
    11,985.79x = 17,978.84 × 4,590.69
  4. Step 4: Simplify right side
    11,985.79x = 82,535,296.06
  5. Step 5: Solve for x
    x = 82,535,296.06/11,985.79
  6. Step 6: Final answer
    x = 6,886.10

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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.