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Finding the Fourth Proportional to 21,690.36, 32,561.40 and 12,929.40

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Solution

The fourth proportional to 21,690.36, 32,561.40 and 12,929.40 is: 19,409.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,690.36 : 32,561.40 = 12,929.40 : x
  2. Step 2: Convert to fraction form
    21,690.36/32,561.40 = 12,929.40/x
  3. Step 3: Cross multiply
    21,690.36x = 32,561.40 × 12,929.40
  4. Step 4: Simplify right side
    21,690.36x = 420,999,365.16
  5. Step 5: Solve for x
    x = 420,999,365.16/21,690.36
  6. Step 6: Final answer
    x = 19,409.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.