Home / 28,405.76-39,185.52-21,679.72

Finding the Fourth Proportional to 28,405.76, 39,185.52 and 21,679.72

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Solution

The fourth proportional to 28,405.76, 39,185.52 and 21,679.72 is: 29,907.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,405.76 : 39,185.52 = 21,679.72 : x
  2. Step 2: Convert to fraction form
    28,405.76/39,185.52 = 21,679.72/x
  3. Step 3: Cross multiply
    28,405.76x = 39,185.52 × 21,679.72
  4. Step 4: Simplify right side
    28,405.76x = 849,531,101.65
  5. Step 5: Solve for x
    x = 849,531,101.65/28,405.76
  6. Step 6: Final answer
    x = 29,907.00

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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.