Home / 12,875.40-19,315.28-3,988.69

Finding the Fourth Proportional to 12,875.40, 19,315.28 and 3,988.69

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Solution

The fourth proportional to 12,875.40, 19,315.28 and 3,988.69 is: 5,983.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,875.40 : 19,315.28 = 3,988.69 : x
  2. Step 2: Convert to fraction form
    12,875.40/19,315.28 = 3,988.69/x
  3. Step 3: Cross multiply
    12,875.40x = 19,315.28 × 3,988.69
  4. Step 4: Simplify right side
    12,875.40x = 77,042,595.95
  5. Step 5: Solve for x
    x = 77,042,595.95/12,875.40
  6. Step 6: Final answer
    x = 5,983.71

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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.