Home / 20,920.44-28,870.12-11,360.25

Finding the Fourth Proportional to 20,920.44, 28,870.12 and 11,360.25

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Solution

The fourth proportional to 20,920.44, 28,870.12 and 11,360.25 is: 15,677.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.44 : 28,870.12 = 11,360.25 : x
  2. Step 2: Convert to fraction form
    20,920.44/28,870.12 = 11,360.25/x
  3. Step 3: Cross multiply
    20,920.44x = 28,870.12 × 11,360.25
  4. Step 4: Simplify right side
    20,920.44x = 327,971,844.18
  5. Step 5: Solve for x
    x = 327,971,844.18/20,920.44
  6. Step 6: Final answer
    x = 15,677.10

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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.