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Finding the Fourth Proportional to 12,643.55, 18,967.55 and 4,321.61

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Solution

The fourth proportional to 12,643.55, 18,967.55 and 4,321.61 is: 6,483.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,643.55 : 18,967.55 = 4,321.61 : x
  2. Step 2: Convert to fraction form
    12,643.55/18,967.55 = 4,321.61/x
  3. Step 3: Cross multiply
    12,643.55x = 18,967.55 × 4,321.61
  4. Step 4: Simplify right side
    12,643.55x = 81,970,237.31
  5. Step 5: Solve for x
    x = 81,970,237.31/12,643.55
  6. Step 6: Final answer
    x = 6,483.17

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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.