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Finding the Fourth Proportional to 12,655.66, 18,969.99 and 6,420.28

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Solution

The fourth proportional to 12,655.66, 18,969.99 and 6,420.28 is: 9,623.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,655.66 : 18,969.99 = 6,420.28 : x
  2. Step 2: Convert to fraction form
    12,655.66/18,969.99 = 6,420.28/x
  3. Step 3: Cross multiply
    12,655.66x = 18,969.99 × 6,420.28
  4. Step 4: Simplify right side
    12,655.66x = 121,792,647.40
  5. Step 5: Solve for x
    x = 121,792,647.40/12,655.66
  6. Step 6: Final answer
    x = 9,623.57

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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.