Home / 21,478.63-29,642.13-11,920.32

Finding the Fourth Proportional to 21,478.63, 29,642.13 and 11,920.32

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Solution

The fourth proportional to 21,478.63, 29,642.13 and 11,920.32 is: 16,450.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,478.63 : 29,642.13 = 11,920.32 : x
  2. Step 2: Convert to fraction form
    21,478.63/29,642.13 = 11,920.32/x
  3. Step 3: Cross multiply
    21,478.63x = 29,642.13 × 11,920.32
  4. Step 4: Simplify right side
    21,478.63x = 353,343,675.08
  5. Step 5: Solve for x
    x = 353,343,675.08/21,478.63
  6. Step 6: Final answer
    x = 16,450.94

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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.