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Finding the Fourth Proportional to 28,815.75, 39,765.74 and 15,567.75

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Solution

The fourth proportional to 28,815.75, 39,765.74 and 15,567.75 is: 21,483.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,815.75 : 39,765.74 = 15,567.75 : x
  2. Step 2: Convert to fraction form
    28,815.75/39,765.74 = 15,567.75/x
  3. Step 3: Cross multiply
    28,815.75x = 39,765.74 × 15,567.75
  4. Step 4: Simplify right side
    28,815.75x = 619,063,021.05
  5. Step 5: Solve for x
    x = 619,063,021.05/28,815.75
  6. Step 6: Final answer
    x = 21,483.50

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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.