Home / 28,355.27-39,129.89-15,780.02

Finding the Fourth Proportional to 28,355.27, 39,129.89 and 15,780.02

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Solution

The fourth proportional to 28,355.27, 39,129.89 and 15,780.02 is: 21,776.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,355.27 : 39,129.89 = 15,780.02 : x
  2. Step 2: Convert to fraction form
    28,355.27/39,129.89 = 15,780.02/x
  3. Step 3: Cross multiply
    28,355.27x = 39,129.89 × 15,780.02
  4. Step 4: Simplify right side
    28,355.27x = 617,470,172.25
  5. Step 5: Solve for x
    x = 617,470,172.25/28,355.27
  6. Step 6: Final answer
    x = 21,776.21

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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.