Home / 12,938.20-17,855.21-7,904.68

Finding the Fourth Proportional to 12,938.20, 17,855.21 and 7,904.68

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Solution

The fourth proportional to 12,938.20, 17,855.21 and 7,904.68 is: 10,908.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,938.20 : 17,855.21 = 7,904.68 : x
  2. Step 2: Convert to fraction form
    12,938.20/17,855.21 = 7,904.68/x
  3. Step 3: Cross multiply
    12,938.20x = 17,855.21 × 7,904.68
  4. Step 4: Simplify right side
    12,938.20x = 141,139,696.51
  5. Step 5: Solve for x
    x = 141,139,696.51/12,938.20
  6. Step 6: Final answer
    x = 10,908.76

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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.