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Finding the Fourth Proportional to 19,159.20, 28,738.80 and 12,506.40

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Solution

The fourth proportional to 19,159.20, 28,738.80 and 12,506.40 is: 18,759.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,159.20 : 28,738.80 = 12,506.40 : x
  2. Step 2: Convert to fraction form
    19,159.20/28,738.80 = 12,506.40/x
  3. Step 3: Cross multiply
    19,159.20x = 28,738.80 × 12,506.40
  4. Step 4: Simplify right side
    19,159.20x = 359,418,928.32
  5. Step 5: Solve for x
    x = 359,418,928.32/19,159.20
  6. Step 6: Final answer
    x = 18,759.60

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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.