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Finding the Fourth Proportional to 20,801.60, 28,705.52 and 11,370

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Solution

The fourth proportional to 20,801.60, 28,705.52 and 11,370 is: 15,690.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,801.60 : 28,705.52 = 11,370 : x
  2. Step 2: Convert to fraction form
    20,801.60/28,705.52 = 11,370/x
  3. Step 3: Cross multiply
    20,801.60x = 28,705.52 × 11,370
  4. Step 4: Simplify right side
    20,801.60x = 326,381,762.40
  5. Step 5: Solve for x
    x = 326,381,762.40/20,801.60
  6. Step 6: Final answer
    x = 15,690.22

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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.