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Finding the Fourth Proportional to 13,508.06, 18,643.29 and 7,919.06

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Solution

The fourth proportional to 13,508.06, 18,643.29 and 7,919.06 is: 10,929.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,508.06 : 18,643.29 = 7,919.06 : x
  2. Step 2: Convert to fraction form
    13,508.06/18,643.29 = 7,919.06/x
  3. Step 3: Cross multiply
    13,508.06x = 18,643.29 × 7,919.06
  4. Step 4: Simplify right side
    13,508.06x = 147,637,349.02
  5. Step 5: Solve for x
    x = 147,637,349.02/13,508.06
  6. Step 6: Final answer
    x = 10,929.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.