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Finding the Fourth Proportional to 8,456.40, 11,809.80 and 8,456.40

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Solution

The fourth proportional to 8,456.40, 11,809.80 and 8,456.40 is: 11,809.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,456.40 : 11,809.80 = 8,456.40 : x
  2. Step 2: Convert to fraction form
    8,456.40/11,809.80 = 8,456.40/x
  3. Step 3: Cross multiply
    8,456.40x = 11,809.80 × 8,456.40
  4. Step 4: Simplify right side
    8,456.40x = 99,868,392.72
  5. Step 5: Solve for x
    x = 99,868,392.72/8,456.40
  6. Step 6: Final answer
    x = 11,809.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.