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Finding the Fourth Proportional to 28,412, 39,208.84 and 15,665.70

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Solution

The fourth proportional to 28,412, 39,208.84 and 15,665.70 is: 21,618.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,412 : 39,208.84 = 15,665.70 : x
  2. Step 2: Convert to fraction form
    28,412/39,208.84 = 15,665.70/x
  3. Step 3: Cross multiply
    28,412x = 39,208.84 × 15,665.70
  4. Step 4: Simplify right side
    28,412x = 614,233,924.79
  5. Step 5: Solve for x
    x = 614,233,924.79/28,412
  6. Step 6: Final answer
    x = 21,618.82

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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.