Home / 21,019.19-28,990.07-13,466.22

Finding the Fourth Proportional to 21,019.19, 28,990.07 and 13,466.22

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Solution

The fourth proportional to 21,019.19, 28,990.07 and 13,466.22 is: 18,572.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,019.19 : 28,990.07 = 13,466.22 : x
  2. Step 2: Convert to fraction form
    21,019.19/28,990.07 = 13,466.22/x
  3. Step 3: Cross multiply
    21,019.19x = 28,990.07 × 13,466.22
  4. Step 4: Simplify right side
    21,019.19x = 390,386,534.89
  5. Step 5: Solve for x
    x = 390,386,534.89/21,019.19
  6. Step 6: Final answer
    x = 18,572.86

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Double scale
Find fourth proportional to 21,020.19, 28,991.45 and 13,467.22
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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.