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Finding the Fourth Proportional to 14,536.80, 19,990.80 and 12,787.20

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Solution

The fourth proportional to 14,536.80, 19,990.80 and 12,787.20 is: 17,584.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,536.80 : 19,990.80 = 12,787.20 : x
  2. Step 2: Convert to fraction form
    14,536.80/19,990.80 = 12,787.20/x
  3. Step 3: Cross multiply
    14,536.80x = 19,990.80 × 12,787.20
  4. Step 4: Simplify right side
    14,536.80x = 255,626,357.76
  5. Step 5: Solve for x
    x = 255,626,357.76/14,536.80
  6. Step 6: Final answer
    x = 17,584.78

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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.