Home / 28,815.78-39,765.75-15,567.78

Finding the Fourth Proportional to 28,815.78, 39,765.75 and 15,567.78

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Solution

The fourth proportional to 28,815.78, 39,765.75 and 15,567.78 is: 21,483.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,815.78 : 39,765.75 = 15,567.78 : x
  2. Step 2: Convert to fraction form
    28,815.78/39,765.75 = 15,567.78/x
  3. Step 3: Cross multiply
    28,815.78x = 39,765.75 × 15,567.78
  4. Step 4: Simplify right side
    28,815.78x = 619,064,447.54
  5. Step 5: Solve for x
    x = 619,064,447.54/28,815.78
  6. Step 6: Final answer
    x = 21,483.52

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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.