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Finding the Fourth Proportional to 28,395, 39,185.10 and 15,820.56

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Solution

The fourth proportional to 28,395, 39,185.10 and 15,820.56 is: 21,832.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,395 : 39,185.10 = 15,820.56 : x
  2. Step 2: Convert to fraction form
    28,395/39,185.10 = 15,820.56/x
  3. Step 3: Cross multiply
    28,395x = 39,185.10 × 15,820.56
  4. Step 4: Simplify right side
    28,395x = 619,930,225.66
  5. Step 5: Solve for x
    x = 619,930,225.66/28,395
  6. Step 6: Final answer
    x = 21,832.37

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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.