Home / 20,802.60-31,142.70-12,987.72

Finding the Fourth Proportional to 20,802.60, 31,142.70 and 12,987.72

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Solution

The fourth proportional to 20,802.60, 31,142.70 and 12,987.72 is: 19,443.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,802.60 : 31,142.70 = 12,987.72 : x
  2. Step 2: Convert to fraction form
    20,802.60/31,142.70 = 12,987.72/x
  3. Step 3: Cross multiply
    20,802.60x = 31,142.70 × 12,987.72
  4. Step 4: Simplify right side
    20,802.60x = 404,472,667.64
  5. Step 5: Solve for x
    x = 404,472,667.64/20,802.60
  6. Step 6: Final answer
    x = 19,443.37

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1.5x scale

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.