Home / 28,128.96-42,193.49-8,421.39

Finding the Fourth Proportional to 28,128.96, 42,193.49 and 8,421.39

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Solution

The fourth proportional to 28,128.96, 42,193.49 and 8,421.39 is: 12,632.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,128.96 : 42,193.49 = 8,421.39 : x
  2. Step 2: Convert to fraction form
    28,128.96/42,193.49 = 8,421.39/x
  3. Step 3: Cross multiply
    28,128.96x = 42,193.49 × 8,421.39
  4. Step 4: Simplify right side
    28,128.96x = 355,327,792.64
  5. Step 5: Solve for x
    x = 355,327,792.64/28,128.96
  6. Step 6: Final answer
    x = 12,632.10

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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.