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Finding the Fourth Proportional to 18,955.50, 28,433.25 and 6,643.50

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Solution

The fourth proportional to 18,955.50, 28,433.25 and 6,643.50 is: 9,965.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,955.50 : 28,433.25 = 6,643.50 : x
  2. Step 2: Convert to fraction form
    18,955.50/28,433.25 = 6,643.50/x
  3. Step 3: Cross multiply
    18,955.50x = 28,433.25 × 6,643.50
  4. Step 4: Simplify right side
    18,955.50x = 188,896,296.38
  5. Step 5: Solve for x
    x = 188,896,296.38/18,955.50
  6. Step 6: Final answer
    x = 9,965.25

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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.