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Finding the Fourth Proportional to 21,395.40, 29,530.80 and 12,449.40

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Solution

The fourth proportional to 21,395.40, 29,530.80 and 12,449.40 is: 17,183.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,395.40 : 29,530.80 = 12,449.40 : x
  2. Step 2: Convert to fraction form
    21,395.40/29,530.80 = 12,449.40/x
  3. Step 3: Cross multiply
    21,395.40x = 29,530.80 × 12,449.40
  4. Step 4: Simplify right side
    21,395.40x = 367,640,741.52
  5. Step 5: Solve for x
    x = 367,640,741.52/21,395.40
  6. Step 6: Final answer
    x = 17,183.17

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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.