Home / 13,551.42-20,312.30-6,978

Finding the Fourth Proportional to 13,551.42, 20,312.30 and 6,978

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Solution

The fourth proportional to 13,551.42, 20,312.30 and 6,978 is: 10,459.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,551.42 : 20,312.30 = 6,978 : x
  2. Step 2: Convert to fraction form
    13,551.42/20,312.30 = 6,978/x
  3. Step 3: Cross multiply
    13,551.42x = 20,312.30 × 6,978
  4. Step 4: Simplify right side
    13,551.42x = 141,739,229.40
  5. Step 5: Solve for x
    x = 141,739,229.40/13,551.42
  6. Step 6: Final answer
    x = 10,459.36

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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.