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Finding the Fourth Proportional to 45,311.04, 67,978.76 and 19,008.72

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Solution

The fourth proportional to 45,311.04, 67,978.76 and 19,008.72 is: 28,518.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,311.04 : 67,978.76 = 19,008.72 : x
  2. Step 2: Convert to fraction form
    45,311.04/67,978.76 = 19,008.72/x
  3. Step 3: Cross multiply
    45,311.04x = 67,978.76 × 19,008.72
  4. Step 4: Simplify right side
    45,311.04x = 1,292,189,119.74
  5. Step 5: Solve for x
    x = 1,292,189,119.74/45,311.04
  6. Step 6: Final answer
    x = 28,518.20

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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.