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Finding the Fourth Proportional to 361,488.40, 542,128.92 and 139,820.56

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Solution

The fourth proportional to 361,488.40, 542,128.92 and 139,820.56 is: 209,690.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    361,488.40 : 542,128.92 = 139,820.56 : x
  2. Step 2: Convert to fraction form
    361,488.40/542,128.92 = 139,820.56/x
  3. Step 3: Cross multiply
    361,488.40x = 542,128.92 × 139,820.56
  4. Step 4: Simplify right side
    361,488.40x = 75,800,769,186.60
  5. Step 5: Solve for x
    x = 75,800,769,186.60/361,488.40
  6. Step 6: Final answer
    x = 209,690.74

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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.