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Finding the Fourth Proportional to 423,138.48, 634,722.84 and 142,658.16

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Solution

The fourth proportional to 423,138.48, 634,722.84 and 142,658.16 is: 213,992.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,138.48 : 634,722.84 = 142,658.16 : x
  2. Step 2: Convert to fraction form
    423,138.48/634,722.84 = 142,658.16/x
  3. Step 3: Cross multiply
    423,138.48x = 634,722.84 × 142,658.16
  4. Step 4: Simplify right side
    423,138.48x = 90,548,392,464.37
  5. Step 5: Solve for x
    x = 90,548,392,464.37/423,138.48
  6. Step 6: Final answer
    x = 213,992.34

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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.