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Finding the Fourth Proportional to 21,290.58, 29,382.48 and 11,859.48

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Solution

The fourth proportional to 21,290.58, 29,382.48 and 11,859.48 is: 16,366.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,290.58 : 29,382.48 = 11,859.48 : x
  2. Step 2: Convert to fraction form
    21,290.58/29,382.48 = 11,859.48/x
  3. Step 3: Cross multiply
    21,290.58x = 29,382.48 × 11,859.48
  4. Step 4: Simplify right side
    21,290.58x = 348,460,933.91
  5. Step 5: Solve for x
    x = 348,460,933.91/21,290.58
  6. Step 6: Final answer
    x = 16,366.91

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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.