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Finding the Fourth Proportional to 156.18, 215.58 and 98.01

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Solution

The fourth proportional to 156.18, 215.58 and 98.01 is: 135.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.18 : 215.58 = 98.01 : x
  2. Step 2: Convert to fraction form
    156.18/215.58 = 98.01/x
  3. Step 3: Cross multiply
    156.18x = 215.58 × 98.01
  4. Step 4: Simplify right side
    156.18x = 21,129.00
  5. Step 5: Solve for x
    x = 21,129.00/156.18
  6. Step 6: Final answer
    x = 135.29

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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.