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Finding the Fourth Proportional to 13,145.50, 19,718.39 and 3,911.50

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Solution

The fourth proportional to 13,145.50, 19,718.39 and 3,911.50 is: 5,867.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,145.50 : 19,718.39 = 3,911.50 : x
  2. Step 2: Convert to fraction form
    13,145.50/19,718.39 = 3,911.50/x
  3. Step 3: Cross multiply
    13,145.50x = 19,718.39 × 3,911.50
  4. Step 4: Simplify right side
    13,145.50x = 77,128,482.49
  5. Step 5: Solve for x
    x = 77,128,482.49/13,145.50
  6. Step 6: Final answer
    x = 5,867.29

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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.