Home / 28,515.29-42,780.21-11,869.79

Finding the Fourth Proportional to 28,515.29, 42,780.21 and 11,869.79

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Solution

The fourth proportional to 28,515.29, 42,780.21 and 11,869.79 is: 17,807.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,515.29 : 42,780.21 = 11,869.79 : x
  2. Step 2: Convert to fraction form
    28,515.29/42,780.21 = 11,869.79/x
  3. Step 3: Cross multiply
    28,515.29x = 42,780.21 × 11,869.79
  4. Step 4: Simplify right side
    28,515.29x = 507,791,894.95
  5. Step 5: Solve for x
    x = 507,791,894.95/28,515.29
  6. Step 6: Final answer
    x = 17,807.71

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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.