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Finding the Fourth Proportional to 21,759.40, 30,026.92 and 12,328.04

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Solution

The fourth proportional to 21,759.40, 30,026.92 and 12,328.04 is: 17,012.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,759.40 : 30,026.92 = 12,328.04 : x
  2. Step 2: Convert to fraction form
    21,759.40/30,026.92 = 12,328.04/x
  3. Step 3: Cross multiply
    21,759.40x = 30,026.92 × 12,328.04
  4. Step 4: Simplify right side
    21,759.40x = 370,173,070.84
  5. Step 5: Solve for x
    x = 370,173,070.84/21,759.40
  6. Step 6: Final answer
    x = 17,012.10

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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.