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Finding the Fourth Proportional to 156,987.80, 235,276.90 and 72,738.20

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Solution

The fourth proportional to 156,987.80, 235,276.90 and 72,738.20 is: 109,012.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,987.80 : 235,276.90 = 72,738.20 : x
  2. Step 2: Convert to fraction form
    156,987.80/235,276.90 = 72,738.20/x
  3. Step 3: Cross multiply
    156,987.80x = 235,276.90 × 72,738.20
  4. Step 4: Simplify right side
    156,987.80x = 17,113,618,207.58
  5. Step 5: Solve for x
    x = 17,113,618,207.58/156,987.80
  6. Step 6: Final answer
    x = 109,012.41

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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.