Home / 18,911.30-28,359.45-6,428.79

Finding the Fourth Proportional to 18,911.30, 28,359.45 and 6,428.79

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Solution

The fourth proportional to 18,911.30, 28,359.45 and 6,428.79 is: 9,640.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.30 : 28,359.45 = 6,428.79 : x
  2. Step 2: Convert to fraction form
    18,911.30/28,359.45 = 6,428.79/x
  3. Step 3: Cross multiply
    18,911.30x = 28,359.45 × 6,428.79
  4. Step 4: Simplify right side
    18,911.30x = 182,316,948.57
  5. Step 5: Solve for x
    x = 182,316,948.57/18,911.30
  6. Step 6: Final answer
    x = 9,640.64

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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.