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Finding the Fourth Proportional to 21,393.70, 29,524.21 and 13,219.11

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Solution

The fourth proportional to 21,393.70, 29,524.21 and 13,219.11 is: 18,242.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,393.70 : 29,524.21 = 13,219.11 : x
  2. Step 2: Convert to fraction form
    21,393.70/29,524.21 = 13,219.11/x
  3. Step 3: Cross multiply
    21,393.70x = 29,524.21 × 13,219.11
  4. Step 4: Simplify right side
    21,393.70x = 390,283,779.65
  5. Step 5: Solve for x
    x = 390,283,779.65/21,393.70
  6. Step 6: Final answer
    x = 18,242.93

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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.