Home / 21,328.06-29,438.58-12,378.44

Finding the Fourth Proportional to 21,328.06, 29,438.58 and 12,378.44

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Solution

The fourth proportional to 21,328.06, 29,438.58 and 12,378.44 is: 17,085.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,328.06 : 29,438.58 = 12,378.44 : x
  2. Step 2: Convert to fraction form
    21,328.06/29,438.58 = 12,378.44/x
  3. Step 3: Cross multiply
    21,328.06x = 29,438.58 × 12,378.44
  4. Step 4: Simplify right side
    21,328.06x = 364,403,696.22
  5. Step 5: Solve for x
    x = 364,403,696.22/21,328.06
  6. Step 6: Final answer
    x = 17,085.65

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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.