Home / 21,290.40-29,378.16-11,855.52

Finding the Fourth Proportional to 21,290.40, 29,378.16 and 11,855.52

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Solution

The fourth proportional to 21,290.40, 29,378.16 and 11,855.52 is: 16,359.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,290.40 : 29,378.16 = 11,855.52 : x
  2. Step 2: Convert to fraction form
    21,290.40/29,378.16 = 11,855.52/x
  3. Step 3: Cross multiply
    21,290.40x = 29,378.16 × 11,855.52
  4. Step 4: Simplify right side
    21,290.40x = 348,293,363.44
  5. Step 5: Solve for x
    x = 348,293,363.44/21,290.40
  6. Step 6: Final answer
    x = 16,359.17

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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.