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Finding the Fourth Proportional to 28,315.86, 39,076.03 and 15,569.86

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Solution

The fourth proportional to 28,315.86, 39,076.03 and 15,569.86 is: 21,486.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,315.86 : 39,076.03 = 15,569.86 : x
  2. Step 2: Convert to fraction form
    28,315.86/39,076.03 = 15,569.86/x
  3. Step 3: Cross multiply
    28,315.86x = 39,076.03 × 15,569.86
  4. Step 4: Simplify right side
    28,315.86x = 608,408,442.41
  5. Step 5: Solve for x
    x = 608,408,442.41/28,315.86
  6. Step 6: Final answer
    x = 21,486.49

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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.