Home / 11,821.68-16,319.88-7,840.80

Finding the Fourth Proportional to 11,821.68, 16,319.88 and 7,840.80

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Solution

The fourth proportional to 11,821.68, 16,319.88 and 7,840.80 is: 10,824.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,821.68 : 16,319.88 = 7,840.80 : x
  2. Step 2: Convert to fraction form
    11,821.68/16,319.88 = 7,840.80/x
  3. Step 3: Cross multiply
    11,821.68x = 16,319.88 × 7,840.80
  4. Step 4: Simplify right side
    11,821.68x = 127,960,915.10
  5. Step 5: Solve for x
    x = 127,960,915.10/11,821.68
  6. Step 6: Final answer
    x = 10,824.26

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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.