Home / 20,817.51-28,728.69-11,386.77

Finding the Fourth Proportional to 20,817.51, 28,728.69 and 11,386.77

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Solution

The fourth proportional to 20,817.51, 28,728.69 and 11,386.77 is: 15,714.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.51 : 28,728.69 = 11,386.77 : x
  2. Step 2: Convert to fraction form
    20,817.51/28,728.69 = 11,386.77/x
  3. Step 3: Cross multiply
    20,817.51x = 28,728.69 × 11,386.77
  4. Step 4: Simplify right side
    20,817.51x = 327,126,985.43
  5. Step 5: Solve for x
    x = 327,126,985.43/20,817.51
  6. Step 6: Final answer
    x = 15,714.03

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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.