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Finding the Fourth Proportional to 156.40, 215.82 and 153.16

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Solution

The fourth proportional to 156.40, 215.82 and 153.16 is: 211.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.40 : 215.82 = 153.16 : x
  2. Step 2: Convert to fraction form
    156.40/215.82 = 153.16/x
  3. Step 3: Cross multiply
    156.40x = 215.82 × 153.16
  4. Step 4: Simplify right side
    156.40x = 33,054.99
  5. Step 5: Solve for x
    x = 33,054.99/156.40
  6. Step 6: Final answer
    x = 211.35

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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.