Home / 21,639.40-29,862.60-12,080.20

Finding the Fourth Proportional to 21,639.40, 29,862.60 and 12,080.20

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Solution

The fourth proportional to 21,639.40, 29,862.60 and 12,080.20 is: 16,670.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,639.40 : 29,862.60 = 12,080.20 : x
  2. Step 2: Convert to fraction form
    21,639.40/29,862.60 = 12,080.20/x
  3. Step 3: Cross multiply
    21,639.40x = 29,862.60 × 12,080.20
  4. Step 4: Simplify right side
    21,639.40x = 360,746,180.52
  5. Step 5: Solve for x
    x = 360,746,180.52/21,639.40
  6. Step 6: Final answer
    x = 16,670.80

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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.