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Finding the Fourth Proportional to 21,479, 29,641.94 and 13,417.40

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Solution

The fourth proportional to 21,479, 29,641.94 and 13,417.40 is: 18,516.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,479 : 29,641.94 = 13,417.40 : x
  2. Step 2: Convert to fraction form
    21,479/29,641.94 = 13,417.40/x
  3. Step 3: Cross multiply
    21,479x = 29,641.94 × 13,417.40
  4. Step 4: Simplify right side
    21,479x = 397,717,765.76
  5. Step 5: Solve for x
    x = 397,717,765.76/21,479
  6. Step 6: Final answer
    x = 18,516.59

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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.