Home / 28,131.09-42,159.72-20,700.77

Finding the Fourth Proportional to 28,131.09, 42,159.72 and 20,700.77

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Solution

The fourth proportional to 28,131.09, 42,159.72 and 20,700.77 is: 31,023.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,131.09 : 42,159.72 = 20,700.77 : x
  2. Step 2: Convert to fraction form
    28,131.09/42,159.72 = 20,700.77/x
  3. Step 3: Cross multiply
    28,131.09x = 42,159.72 × 20,700.77
  4. Step 4: Simplify right side
    28,131.09x = 872,738,456.19
  5. Step 5: Solve for x
    x = 872,738,456.19/28,131.09
  6. Step 6: Final answer
    x = 31,023.98

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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.