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Finding the Fourth Proportional to 8,918.70, 13,352.45 and 8,662.70

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Solution

The fourth proportional to 8,918.70, 13,352.45 and 8,662.70 is: 12,969.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,918.70 : 13,352.45 = 8,662.70 : x
  2. Step 2: Convert to fraction form
    8,918.70/13,352.45 = 8,662.70/x
  3. Step 3: Cross multiply
    8,918.70x = 13,352.45 × 8,662.70
  4. Step 4: Simplify right side
    8,918.70x = 115,668,268.62
  5. Step 5: Solve for x
    x = 115,668,268.62/8,918.70
  6. Step 6: Final answer
    x = 12,969.18

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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.