Home / 28,139.68-42,212.64-12,555.28

Finding the Fourth Proportional to 28,139.68, 42,212.64 and 12,555.28

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Solution

The fourth proportional to 28,139.68, 42,212.64 and 12,555.28 is: 18,834.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,139.68 : 42,212.64 = 12,555.28 : x
  2. Step 2: Convert to fraction form
    28,139.68/42,212.64 = 12,555.28/x
  3. Step 3: Cross multiply
    28,139.68x = 42,212.64 × 12,555.28
  4. Step 4: Simplify right side
    28,139.68x = 529,991,514.74
  5. Step 5: Solve for x
    x = 529,991,514.74/28,139.68
  6. Step 6: Final answer
    x = 18,834.31

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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.