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Finding the Fourth Proportional to 28,554.15, 39,405.03 and 15,807.54

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Solution

The fourth proportional to 28,554.15, 39,405.03 and 15,807.54 is: 21,814.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,554.15 : 39,405.03 = 15,807.54 : x
  2. Step 2: Convert to fraction form
    28,554.15/39,405.03 = 15,807.54/x
  3. Step 3: Cross multiply
    28,554.15x = 39,405.03 × 15,807.54
  4. Step 4: Simplify right side
    28,554.15x = 622,896,587.93
  5. Step 5: Solve for x
    x = 622,896,587.93/28,554.15
  6. Step 6: Final answer
    x = 21,814.58

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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.