Home / 28,765.12-39,693.16-21,215.56

Finding the Fourth Proportional to 28,765.12, 39,693.16 and 21,215.56

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Solution

The fourth proportional to 28,765.12, 39,693.16 and 21,215.56 is: 29,275.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,765.12 : 39,693.16 = 21,215.56 : x
  2. Step 2: Convert to fraction form
    28,765.12/39,693.16 = 21,215.56/x
  3. Step 3: Cross multiply
    28,765.12x = 39,693.16 × 21,215.56
  4. Step 4: Simplify right side
    28,765.12x = 842,112,617.57
  5. Step 5: Solve for x
    x = 842,112,617.57/28,765.12
  6. Step 6: Final answer
    x = 29,275.48

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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.