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Finding the Fourth Proportional to 13,985.76, 20,978.70 and 4,125.16

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Solution

The fourth proportional to 13,985.76, 20,978.70 and 4,125.16 is: 6,187.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,985.76 : 20,978.70 = 4,125.16 : x
  2. Step 2: Convert to fraction form
    13,985.76/20,978.70 = 4,125.16/x
  3. Step 3: Cross multiply
    13,985.76x = 20,978.70 × 4,125.16
  4. Step 4: Simplify right side
    13,985.76x = 86,540,494.09
  5. Step 5: Solve for x
    x = 86,540,494.09/13,985.76
  6. Step 6: Final answer
    x = 6,187.76

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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.