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Finding the Fourth Proportional to 8,415, 12,629.34 and 7,190.28

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Solution

The fourth proportional to 8,415, 12,629.34 and 7,190.28 is: 10,791.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,415 : 12,629.34 = 7,190.28 : x
  2. Step 2: Convert to fraction form
    8,415/12,629.34 = 7,190.28/x
  3. Step 3: Cross multiply
    8,415x = 12,629.34 × 7,190.28
  4. Step 4: Simplify right side
    8,415x = 90,808,490.82
  5. Step 5: Solve for x
    x = 90,808,490.82/8,415
  6. Step 6: Final answer
    x = 10,791.26

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Double scale
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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.