Home / 21,639.30-29,862.12-12,078.63

Finding the Fourth Proportional to 21,639.30, 29,862.12 and 12,078.63

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Solution

The fourth proportional to 21,639.30, 29,862.12 and 12,078.63 is: 16,668.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,639.30 : 29,862.12 = 12,078.63 : x
  2. Step 2: Convert to fraction form
    21,639.30/29,862.12 = 12,078.63/x
  3. Step 3: Cross multiply
    21,639.30x = 29,862.12 × 12,078.63
  4. Step 4: Simplify right side
    21,639.30x = 360,693,498.50
  5. Step 5: Solve for x
    x = 360,693,498.50/21,639.30
  6. Step 6: Final answer
    x = 16,668.45

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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.