Home / 20,780.06-28,678.02-11,830.46

Finding the Fourth Proportional to 20,780.06, 28,678.02 and 11,830.46

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Solution

The fourth proportional to 20,780.06, 28,678.02 and 11,830.46 is: 16,326.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.06 : 28,678.02 = 11,830.46 : x
  2. Step 2: Convert to fraction form
    20,780.06/28,678.02 = 11,830.46/x
  3. Step 3: Cross multiply
    20,780.06x = 28,678.02 × 11,830.46
  4. Step 4: Simplify right side
    20,780.06x = 339,274,168.49
  5. Step 5: Solve for x
    x = 339,274,168.49/20,780.06
  6. Step 6: Final answer
    x = 16,326.91

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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.