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Finding the Fourth Proportional to 6,419.80, 9,615.30 and 5,267.80

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Solution

The fourth proportional to 6,419.80, 9,615.30 and 5,267.80 is: 7,889.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,419.80 : 9,615.30 = 5,267.80 : x
  2. Step 2: Convert to fraction form
    6,419.80/9,615.30 = 5,267.80/x
  3. Step 3: Cross multiply
    6,419.80x = 9,615.30 × 5,267.80
  4. Step 4: Simplify right side
    6,419.80x = 50,651,477.34
  5. Step 5: Solve for x
    x = 50,651,477.34/6,419.80
  6. Step 6: Final answer
    x = 7,889.88

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1.5x scale

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.