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Finding the Fourth Proportional to 185,879.40, 278,624.16 and 90,978.72

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Solution

The fourth proportional to 185,879.40, 278,624.16 and 90,978.72 is: 136,372.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    185,879.40 : 278,624.16 = 90,978.72 : x
  2. Step 2: Convert to fraction form
    185,879.40/278,624.16 = 90,978.72/x
  3. Step 3: Cross multiply
    185,879.40x = 278,624.16 × 90,978.72
  4. Step 4: Simplify right side
    185,879.40x = 25,348,869,437.88
  5. Step 5: Solve for x
    x = 25,348,869,437.88/185,879.40
  6. Step 6: Final answer
    x = 136,372.67

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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.