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Finding the Fourth Proportional to 8,289.80, 12,410.40 and 7,317.80

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Solution

The fourth proportional to 8,289.80, 12,410.40 and 7,317.80 is: 10,955.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,289.80 : 12,410.40 = 7,317.80 : x
  2. Step 2: Convert to fraction form
    8,289.80/12,410.40 = 7,317.80/x
  3. Step 3: Cross multiply
    8,289.80x = 12,410.40 × 7,317.80
  4. Step 4: Simplify right side
    8,289.80x = 90,816,825.12
  5. Step 5: Solve for x
    x = 90,816,825.12/8,289.80
  6. Step 6: Final answer
    x = 10,955.25

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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.