Home / 20,455.12-30,721.58-12,718

Finding the Fourth Proportional to 20,455.12, 30,721.58 and 12,718

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Solution

The fourth proportional to 20,455.12, 30,721.58 and 12,718 is: 19,101.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,455.12 : 30,721.58 = 12,718 : x
  2. Step 2: Convert to fraction form
    20,455.12/30,721.58 = 12,718/x
  3. Step 3: Cross multiply
    20,455.12x = 30,721.58 × 12,718
  4. Step 4: Simplify right side
    20,455.12x = 390,717,054.44
  5. Step 5: Solve for x
    x = 390,717,054.44/20,455.12
  6. Step 6: Final answer
    x = 19,101.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.