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Finding the Fourth Proportional to 156,808.40, 235,115.40 and 90,215.60

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Solution

The fourth proportional to 156,808.40, 235,115.40 and 90,215.60 is: 135,267.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,808.40 : 235,115.40 = 90,215.60 : x
  2. Step 2: Convert to fraction form
    156,808.40/235,115.40 = 90,215.60/x
  3. Step 3: Cross multiply
    156,808.40x = 235,115.40 × 90,215.60
  4. Step 4: Simplify right side
    156,808.40x = 21,211,076,880.24
  5. Step 5: Solve for x
    x = 21,211,076,880.24/156,808.40
  6. Step 6: Final answer
    x = 135,267.48

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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.