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Finding the Fourth Proportional to 28,428, 39,230.64 and 15,852.48

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Solution

The fourth proportional to 28,428, 39,230.64 and 15,852.48 is: 21,876.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,428 : 39,230.64 = 15,852.48 : x
  2. Step 2: Convert to fraction form
    28,428/39,230.64 = 15,852.48/x
  3. Step 3: Cross multiply
    28,428x = 39,230.64 × 15,852.48
  4. Step 4: Simplify right side
    28,428x = 621,902,935.99
  5. Step 5: Solve for x
    x = 621,902,935.99/28,428
  6. Step 6: Final answer
    x = 21,876.42

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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.