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Finding the Fourth Proportional to 28,470, 39,288.78 and 15,894.84

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Solution

The fourth proportional to 28,470, 39,288.78 and 15,894.84 is: 21,934.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,470 : 39,288.78 = 15,894.84 : x
  2. Step 2: Convert to fraction form
    28,470/39,288.78 = 15,894.84/x
  3. Step 3: Cross multiply
    28,470x = 39,288.78 × 15,894.84
  4. Step 4: Simplify right side
    28,470x = 624,488,871.90
  5. Step 5: Solve for x
    x = 624,488,871.90/28,470
  6. Step 6: Final answer
    x = 21,934.98

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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.