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Finding the Fourth Proportional to 18,668.68, 28,005.65 and 6,980.78

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Solution

The fourth proportional to 18,668.68, 28,005.65 and 6,980.78 is: 10,472.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,668.68 : 28,005.65 = 6,980.78 : x
  2. Step 2: Convert to fraction form
    18,668.68/28,005.65 = 6,980.78/x
  3. Step 3: Cross multiply
    18,668.68x = 28,005.65 × 6,980.78
  4. Step 4: Simplify right side
    18,668.68x = 195,501,281.41
  5. Step 5: Solve for x
    x = 195,501,281.41/18,668.68
  6. Step 6: Final answer
    x = 10,472.15

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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.