Home / 12,318.88-18,484.84-7,128.40

Finding the Fourth Proportional to 12,318.88, 18,484.84 and 7,128.40

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Solution

The fourth proportional to 12,318.88, 18,484.84 and 7,128.40 is: 10,696.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,318.88 : 18,484.84 = 7,128.40 : x
  2. Step 2: Convert to fraction form
    12,318.88/18,484.84 = 7,128.40/x
  3. Step 3: Cross multiply
    12,318.88x = 18,484.84 × 7,128.40
  4. Step 4: Simplify right side
    12,318.88x = 131,767,333.46
  5. Step 5: Solve for x
    x = 131,767,333.46/12,318.88
  6. Step 6: Final answer
    x = 10,696.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.