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Finding the Fourth Proportional to 28,089.60, 38,762.88 and 15,513.60

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Solution

The fourth proportional to 28,089.60, 38,762.88 and 15,513.60 is: 21,408.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,089.60 : 38,762.88 = 15,513.60 : x
  2. Step 2: Convert to fraction form
    28,089.60/38,762.88 = 15,513.60/x
  3. Step 3: Cross multiply
    28,089.60x = 38,762.88 × 15,513.60
  4. Step 4: Simplify right side
    28,089.60x = 601,351,815.17
  5. Step 5: Solve for x
    x = 601,351,815.17/28,089.60
  6. Step 6: Final answer
    x = 21,408.34

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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.