Home / 21,515.28-29,688.94-12,561.54

Finding the Fourth Proportional to 21,515.28, 29,688.94 and 12,561.54

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Solution

The fourth proportional to 21,515.28, 29,688.94 and 12,561.54 is: 17,333.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,515.28 : 29,688.94 = 12,561.54 : x
  2. Step 2: Convert to fraction form
    21,515.28/29,688.94 = 12,561.54/x
  3. Step 3: Cross multiply
    21,515.28x = 29,688.94 × 12,561.54
  4. Step 4: Simplify right side
    21,515.28x = 372,938,807.37
  5. Step 5: Solve for x
    x = 372,938,807.37/21,515.28
  6. Step 6: Final answer
    x = 17,333.67

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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.