Home / 28,428.72-39,210.48-20,872.68

Finding the Fourth Proportional to 28,428.72, 39,210.48 and 20,872.68

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Solution

The fourth proportional to 28,428.72, 39,210.48 and 20,872.68 is: 28,788.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,428.72 : 39,210.48 = 20,872.68 : x
  2. Step 2: Convert to fraction form
    28,428.72/39,210.48 = 20,872.68/x
  3. Step 3: Cross multiply
    28,428.72x = 39,210.48 × 20,872.68
  4. Step 4: Simplify right side
    28,428.72x = 818,427,801.69
  5. Step 5: Solve for x
    x = 818,427,801.69/28,428.72
  6. Step 6: Final answer
    x = 28,788.77

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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.