Home / 15,353.80-21,186.72-8,639.28

Finding the Fourth Proportional to 15,353.80, 21,186.72 and 8,639.28

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Solution

The fourth proportional to 15,353.80, 21,186.72 and 8,639.28 is: 11,921.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,353.80 : 21,186.72 = 8,639.28 : x
  2. Step 2: Convert to fraction form
    15,353.80/21,186.72 = 8,639.28/x
  3. Step 3: Cross multiply
    15,353.80x = 21,186.72 × 8,639.28
  4. Step 4: Simplify right side
    15,353.80x = 183,038,006.36
  5. Step 5: Solve for x
    x = 183,038,006.36/15,353.80
  6. Step 6: Final answer
    x = 11,921.35

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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.