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Finding the Fourth Proportional to 12,898.40, 19,336.80 and 6,742.40

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Solution

The fourth proportional to 12,898.40, 19,336.80 and 6,742.40 is: 10,107.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,898.40 : 19,336.80 = 6,742.40 : x
  2. Step 2: Convert to fraction form
    12,898.40/19,336.80 = 6,742.40/x
  3. Step 3: Cross multiply
    12,898.40x = 19,336.80 × 6,742.40
  4. Step 4: Simplify right side
    12,898.40x = 130,376,440.32
  5. Step 5: Solve for x
    x = 130,376,440.32/12,898.40
  6. Step 6: Final answer
    x = 10,107.95

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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.