Home / 20,920.80-28,868.40-11,970.72

Finding the Fourth Proportional to 20,920.80, 28,868.40 and 11,970.72

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Solution

The fourth proportional to 20,920.80, 28,868.40 and 11,970.72 is: 16,518.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.80 : 28,868.40 = 11,970.72 : x
  2. Step 2: Convert to fraction form
    20,920.80/28,868.40 = 11,970.72/x
  3. Step 3: Cross multiply
    20,920.80x = 28,868.40 × 11,970.72
  4. Step 4: Simplify right side
    20,920.80x = 345,575,533.25
  5. Step 5: Solve for x
    x = 345,575,533.25/20,920.80
  6. Step 6: Final answer
    x = 16,518.28

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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.