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Finding the Fourth Proportional to 21,019.56, 28,990.59 and 13,466.59

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Solution

The fourth proportional to 21,019.56, 28,990.59 and 13,466.59 is: 18,573.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,019.56 : 28,990.59 = 13,466.59 : x
  2. Step 2: Convert to fraction form
    21,019.56/28,990.59 = 13,466.59/x
  3. Step 3: Cross multiply
    21,019.56x = 28,990.59 × 13,466.59
  4. Step 4: Simplify right side
    21,019.56x = 390,404,429.48
  5. Step 5: Solve for x
    x = 390,404,429.48/21,019.56
  6. Step 6: Final answer
    x = 18,573.39

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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.