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Finding the Fourth Proportional to 6,987.60, 10,481.40 and 6,647.40

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Solution

The fourth proportional to 6,987.60, 10,481.40 and 6,647.40 is: 9,971.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,987.60 : 10,481.40 = 6,647.40 : x
  2. Step 2: Convert to fraction form
    6,987.60/10,481.40 = 6,647.40/x
  3. Step 3: Cross multiply
    6,987.60x = 10,481.40 × 6,647.40
  4. Step 4: Simplify right side
    6,987.60x = 69,674,058.36
  5. Step 5: Solve for x
    x = 69,674,058.36/6,987.60
  6. Step 6: Final answer
    x = 9,971.10

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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.