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Finding the Fourth Proportional to 113,722.90, 156,934.20 and 63,421.90

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Solution

The fourth proportional to 113,722.90, 156,934.20 and 63,421.90 is: 87,520.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,722.90 : 156,934.20 = 63,421.90 : x
  2. Step 2: Convert to fraction form
    113,722.90/156,934.20 = 63,421.90/x
  3. Step 3: Cross multiply
    113,722.90x = 156,934.20 × 63,421.90
  4. Step 4: Simplify right side
    113,722.90x = 9,953,065,138.98
  5. Step 5: Solve for x
    x = 9,953,065,138.98/113,722.90
  6. Step 6: Final answer
    x = 87,520.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.