Home / 15,353.84-21,187.20-8,639.12

Finding the Fourth Proportional to 15,353.84, 21,187.20 and 8,639.12

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Solution

The fourth proportional to 15,353.84, 21,187.20 and 8,639.12 is: 11,921.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,353.84 : 21,187.20 = 8,639.12 : x
  2. Step 2: Convert to fraction form
    15,353.84/21,187.20 = 8,639.12/x
  3. Step 3: Cross multiply
    15,353.84x = 21,187.20 × 8,639.12
  4. Step 4: Simplify right side
    15,353.84x = 183,038,763.26
  5. Step 5: Solve for x
    x = 183,038,763.26/15,353.84
  6. Step 6: Final answer
    x = 11,921.37

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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.