Home / 8,918.78-12,313.96-7,971.55

Finding the Fourth Proportional to 8,918.78, 12,313.96 and 7,971.55

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Solution

The fourth proportional to 8,918.78, 12,313.96 and 7,971.55 is: 11,006.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,918.78 : 12,313.96 = 7,971.55 : x
  2. Step 2: Convert to fraction form
    8,918.78/12,313.96 = 7,971.55/x
  3. Step 3: Cross multiply
    8,918.78x = 12,313.96 × 7,971.55
  4. Step 4: Simplify right side
    8,918.78x = 98,161,297.12
  5. Step 5: Solve for x
    x = 98,161,297.12/8,918.78
  6. Step 6: Final answer
    x = 11,006.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.