Home / 21,290.22-29,386.80-12,339.90

Finding the Fourth Proportional to 21,290.22, 29,386.80 and 12,339.90

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Solution

The fourth proportional to 21,290.22, 29,386.80 and 12,339.90 is: 17,032.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,290.22 : 29,386.80 = 12,339.90 : x
  2. Step 2: Convert to fraction form
    21,290.22/29,386.80 = 12,339.90/x
  3. Step 3: Cross multiply
    21,290.22x = 29,386.80 × 12,339.90
  4. Step 4: Simplify right side
    21,290.22x = 362,630,173.32
  5. Step 5: Solve for x
    x = 362,630,173.32/21,290.22
  6. Step 6: Final answer
    x = 17,032.71

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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.