Home / 15,530.28-21,431.94-8,905

Finding the Fourth Proportional to 15,530.28, 21,431.94 and 8,905

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Solution

The fourth proportional to 15,530.28, 21,431.94 and 8,905 is: 12,288.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,530.28 : 21,431.94 = 8,905 : x
  2. Step 2: Convert to fraction form
    15,530.28/21,431.94 = 8,905/x
  3. Step 3: Cross multiply
    15,530.28x = 21,431.94 × 8,905
  4. Step 4: Simplify right side
    15,530.28x = 190,851,425.70
  5. Step 5: Solve for x
    x = 190,851,425.70/15,530.28
  6. Step 6: Final answer
    x = 12,288.99

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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.