Home / 15,495.11-21,383.41-8,421.53

Finding the Fourth Proportional to 15,495.11, 21,383.41 and 8,421.53

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Solution

The fourth proportional to 15,495.11, 21,383.41 and 8,421.53 is: 11,621.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,495.11 : 21,383.41 = 8,421.53 : x
  2. Step 2: Convert to fraction form
    15,495.11/21,383.41 = 8,421.53/x
  3. Step 3: Cross multiply
    15,495.11x = 21,383.41 × 8,421.53
  4. Step 4: Simplify right side
    15,495.11x = 180,081,028.82
  5. Step 5: Solve for x
    x = 180,081,028.82/15,495.11
  6. Step 6: Final answer
    x = 11,621.80

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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.