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Finding the Fourth Proportional to 28,415, 39,212.70 and 15,840.56

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Solution

The fourth proportional to 28,415, 39,212.70 and 15,840.56 is: 21,859.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,415 : 39,212.70 = 15,840.56 : x
  2. Step 2: Convert to fraction form
    28,415/39,212.70 = 15,840.56/x
  3. Step 3: Cross multiply
    28,415x = 39,212.70 × 15,840.56
  4. Step 4: Simplify right side
    28,415x = 621,151,127.11
  5. Step 5: Solve for x
    x = 621,151,127.11/28,415
  6. Step 6: Final answer
    x = 21,859.97

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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.