Home / 15,515.72-21,400.20-9,845.60

Finding the Fourth Proportional to 15,515.72, 21,400.20 and 9,845.60

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Solution

The fourth proportional to 15,515.72, 21,400.20 and 9,845.60 is: 13,579.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,515.72 : 21,400.20 = 9,845.60 : x
  2. Step 2: Convert to fraction form
    15,515.72/21,400.20 = 9,845.60/x
  3. Step 3: Cross multiply
    15,515.72x = 21,400.20 × 9,845.60
  4. Step 4: Simplify right side
    15,515.72x = 210,697,809.12
  5. Step 5: Solve for x
    x = 210,697,809.12/15,515.72
  6. Step 6: Final answer
    x = 13,579.63

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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.