Home / 13,985.36-20,979.32-5,778

Finding the Fourth Proportional to 13,985.36, 20,979.32 and 5,778

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Solution

The fourth proportional to 13,985.36, 20,979.32 and 5,778 is: 8,667.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,985.36 : 20,979.32 = 5,778 : x
  2. Step 2: Convert to fraction form
    13,985.36/20,979.32 = 5,778/x
  3. Step 3: Cross multiply
    13,985.36x = 20,979.32 × 5,778
  4. Step 4: Simplify right side
    13,985.36x = 121,218,510.96
  5. Step 5: Solve for x
    x = 121,218,510.96/13,985.36
  6. Step 6: Final answer
    x = 8,667.53

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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.