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Finding the Fourth Proportional to 12,643.70, 18,981.15 and 7,963.70

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Solution

The fourth proportional to 12,643.70, 18,981.15 and 7,963.70 is: 11,955.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,643.70 : 18,981.15 = 7,963.70 : x
  2. Step 2: Convert to fraction form
    12,643.70/18,981.15 = 7,963.70/x
  3. Step 3: Cross multiply
    12,643.70x = 18,981.15 × 7,963.70
  4. Step 4: Simplify right side
    12,643.70x = 151,160,184.26
  5. Step 5: Solve for x
    x = 151,160,184.26/12,643.70
  6. Step 6: Final answer
    x = 11,955.38

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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.