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Finding the Fourth Proportional to 20,993.47, 28,973.04 and 15,679.06

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Solution

The fourth proportional to 20,993.47, 28,973.04 and 15,679.06 is: 21,638.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.47 : 28,973.04 = 15,679.06 : x
  2. Step 2: Convert to fraction form
    20,993.47/28,973.04 = 15,679.06/x
  3. Step 3: Cross multiply
    20,993.47x = 28,973.04 × 15,679.06
  4. Step 4: Simplify right side
    20,993.47x = 454,270,009.96
  5. Step 5: Solve for x
    x = 454,270,009.96/20,993.47
  6. Step 6: Final answer
    x = 21,638.63

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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.