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Finding the Fourth Proportional to 19,281.90, 28,939.62 and 10,978.62

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Solution

The fourth proportional to 19,281.90, 28,939.62 and 10,978.62 is: 16,477.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,281.90 : 28,939.62 = 10,978.62 : x
  2. Step 2: Convert to fraction form
    19,281.90/28,939.62 = 10,978.62/x
  3. Step 3: Cross multiply
    19,281.90x = 28,939.62 × 10,978.62
  4. Step 4: Simplify right side
    19,281.90x = 317,717,090.92
  5. Step 5: Solve for x
    x = 317,717,090.92/19,281.90
  6. Step 6: Final answer
    x = 16,477.48

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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.