Home / 20,386.89-30,578.85-9,145.71

Finding the Fourth Proportional to 20,386.89, 30,578.85 and 9,145.71

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Solution

The fourth proportional to 20,386.89, 30,578.85 and 9,145.71 is: 13,717.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,386.89 : 30,578.85 = 9,145.71 : x
  2. Step 2: Convert to fraction form
    20,386.89/30,578.85 = 9,145.71/x
  3. Step 3: Cross multiply
    20,386.89x = 30,578.85 × 9,145.71
  4. Step 4: Simplify right side
    20,386.89x = 279,665,294.23
  5. Step 5: Solve for x
    x = 279,665,294.23/20,386.89
  6. Step 6: Final answer
    x = 13,717.90

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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.