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Finding the Fourth Proportional to 156,676.90, 235,015.35 and 90,321.70

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Solution

The fourth proportional to 156,676.90, 235,015.35 and 90,321.70 is: 135,482.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,676.90 : 235,015.35 = 90,321.70 : x
  2. Step 2: Convert to fraction form
    156,676.90/235,015.35 = 90,321.70/x
  3. Step 3: Cross multiply
    156,676.90x = 235,015.35 × 90,321.70
  4. Step 4: Simplify right side
    156,676.90x = 21,226,985,938.10
  5. Step 5: Solve for x
    x = 21,226,985,938.10/156,676.90
  6. Step 6: Final answer
    x = 135,482.55

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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.