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Finding the Fourth Proportional to 156.90, 235.32 and 70.20

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Solution

The fourth proportional to 156.90, 235.32 and 70.20 is: 105.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.90 : 235.32 = 70.20 : x
  2. Step 2: Convert to fraction form
    156.90/235.32 = 70.20/x
  3. Step 3: Cross multiply
    156.90x = 235.32 × 70.20
  4. Step 4: Simplify right side
    156.90x = 16,519.46
  5. Step 5: Solve for x
    x = 16,519.46/156.90
  6. Step 6: Final answer
    x = 105.29

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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.