Home / 12,686.16-19,031.68-3,920.76

Finding the Fourth Proportional to 12,686.16, 19,031.68 and 3,920.76

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Solution

The fourth proportional to 12,686.16, 19,031.68 and 3,920.76 is: 5,881.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,686.16 : 19,031.68 = 3,920.76 : x
  2. Step 2: Convert to fraction form
    12,686.16/19,031.68 = 3,920.76/x
  3. Step 3: Cross multiply
    12,686.16x = 19,031.68 × 3,920.76
  4. Step 4: Simplify right side
    12,686.16x = 74,618,649.68
  5. Step 5: Solve for x
    x = 74,618,649.68/12,686.16
  6. Step 6: Final answer
    x = 5,881.89

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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.