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Finding the Fourth Proportional to 20,860.49, 28,787.49 and 11,300.40

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Solution

The fourth proportional to 20,860.49, 28,787.49 and 11,300.40 is: 15,594.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.49 : 28,787.49 = 11,300.40 : x
  2. Step 2: Convert to fraction form
    20,860.49/28,787.49 = 11,300.40/x
  3. Step 3: Cross multiply
    20,860.49x = 28,787.49 × 11,300.40
  4. Step 4: Simplify right side
    20,860.49x = 325,310,152.00
  5. Step 5: Solve for x
    x = 325,310,152.00/20,860.49
  6. Step 6: Final answer
    x = 15,594.56

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1.5x scale

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.