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Finding the Fourth Proportional to 18,712.20, 28,068.30 and 12,880.20

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Solution

The fourth proportional to 18,712.20, 28,068.30 and 12,880.20 is: 19,320.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,712.20 : 28,068.30 = 12,880.20 : x
  2. Step 2: Convert to fraction form
    18,712.20/28,068.30 = 12,880.20/x
  3. Step 3: Cross multiply
    18,712.20x = 28,068.30 × 12,880.20
  4. Step 4: Simplify right side
    18,712.20x = 361,525,317.66
  5. Step 5: Solve for x
    x = 361,525,317.66/18,712.20
  6. Step 6: Final answer
    x = 19,320.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.