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Finding the Fourth Proportional to 19,978.58, 29,960.08 and 7,491.80

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Solution

The fourth proportional to 19,978.58, 29,960.08 and 7,491.80 is: 11,234.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,978.58 : 29,960.08 = 7,491.80 : x
  2. Step 2: Convert to fraction form
    19,978.58/29,960.08 = 7,491.80/x
  3. Step 3: Cross multiply
    19,978.58x = 29,960.08 × 7,491.80
  4. Step 4: Simplify right side
    19,978.58x = 224,454,927.34
  5. Step 5: Solve for x
    x = 224,454,927.34/19,978.58
  6. Step 6: Final answer
    x = 11,234.78

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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.