Home / 21,003.12-28,992.60-12,618

Finding the Fourth Proportional to 21,003.12, 28,992.60 and 12,618

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Solution

The fourth proportional to 21,003.12, 28,992.60 and 12,618 is: 17,417.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,003.12 : 28,992.60 = 12,618 : x
  2. Step 2: Convert to fraction form
    21,003.12/28,992.60 = 12,618/x
  3. Step 3: Cross multiply
    21,003.12x = 28,992.60 × 12,618
  4. Step 4: Simplify right side
    21,003.12x = 365,828,626.80
  5. Step 5: Solve for x
    x = 365,828,626.80/21,003.12
  6. Step 6: Final answer
    x = 17,417.82

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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.