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Finding the Fourth Proportional to 8,679.79, 11,978.04 and 4,700.89

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Solution

The fourth proportional to 8,679.79, 11,978.04 and 4,700.89 is: 6,487.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.79 : 11,978.04 = 4,700.89 : x
  2. Step 2: Convert to fraction form
    8,679.79/11,978.04 = 4,700.89/x
  3. Step 3: Cross multiply
    8,679.79x = 11,978.04 × 4,700.89
  4. Step 4: Simplify right side
    8,679.79x = 56,307,448.46
  5. Step 5: Solve for x
    x = 56,307,448.46/8,679.79
  6. Step 6: Final answer
    x = 6,487.19

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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.