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Finding the Fourth Proportional to 8,395.36, 12,643 and 7,312.78

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Solution

The fourth proportional to 8,395.36, 12,643 and 7,312.78 is: 11,012.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,395.36 : 12,643 = 7,312.78 : x
  2. Step 2: Convert to fraction form
    8,395.36/12,643 = 7,312.78/x
  3. Step 3: Cross multiply
    8,395.36x = 12,643 × 7,312.78
  4. Step 4: Simplify right side
    8,395.36x = 92,455,477.54
  5. Step 5: Solve for x
    x = 92,455,477.54/8,395.36
  6. Step 6: Final answer
    x = 11,012.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.