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Finding the Fourth Proportional to 156.03, 215.34 and 90.56

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Solution

The fourth proportional to 156.03, 215.34 and 90.56 is: 124.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.03 : 215.34 = 90.56 : x
  2. Step 2: Convert to fraction form
    156.03/215.34 = 90.56/x
  3. Step 3: Cross multiply
    156.03x = 215.34 × 90.56
  4. Step 4: Simplify right side
    156.03x = 19,500.11
  5. Step 5: Solve for x
    x = 19,500.11/156.03
  6. Step 6: Final answer
    x = 124.98

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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.