Home / 15,228.11-21,012.95-8,421.21

Finding the Fourth Proportional to 15,228.11, 21,012.95 and 8,421.21

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Solution

The fourth proportional to 15,228.11, 21,012.95 and 8,421.21 is: 11,620.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,228.11 : 21,012.95 = 8,421.21 : x
  2. Step 2: Convert to fraction form
    15,228.11/21,012.95 = 8,421.21/x
  3. Step 3: Cross multiply
    15,228.11x = 21,012.95 × 8,421.21
  4. Step 4: Simplify right side
    15,228.11x = 176,954,485.72
  5. Step 5: Solve for x
    x = 176,954,485.72/15,228.11
  6. Step 6: Final answer
    x = 11,620.25

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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.