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Finding the Fourth Proportional to 21,779.90, 30,063.03 and 17,311.58

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Solution

The fourth proportional to 21,779.90, 30,063.03 and 17,311.58 is: 23,895.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,779.90 : 30,063.03 = 17,311.58 : x
  2. Step 2: Convert to fraction form
    21,779.90/30,063.03 = 17,311.58/x
  3. Step 3: Cross multiply
    21,779.90x = 30,063.03 × 17,311.58
  4. Step 4: Simplify right side
    21,779.90x = 520,438,548.89
  5. Step 5: Solve for x
    x = 520,438,548.89/21,779.90
  6. Step 6: Final answer
    x = 23,895.36

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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.