Home / 28,355.84-39,132.96-15,780.64

Finding the Fourth Proportional to 28,355.84, 39,132.96 and 15,780.64

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Solution

The fourth proportional to 28,355.84, 39,132.96 and 15,780.64 is: 21,778.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,355.84 : 39,132.96 = 15,780.64 : x
  2. Step 2: Convert to fraction form
    28,355.84/39,132.96 = 15,780.64/x
  3. Step 3: Cross multiply
    28,355.84x = 39,132.96 × 15,780.64
  4. Step 4: Simplify right side
    28,355.84x = 617,543,153.89
  5. Step 5: Solve for x
    x = 617,543,153.89/28,355.84
  6. Step 6: Final answer
    x = 21,778.34

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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.