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Finding the Fourth Proportional to 156.64, 216.08 and 117.76

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Solution

The fourth proportional to 156.64, 216.08 and 117.76 is: 162.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.64 : 216.08 = 117.76 : x
  2. Step 2: Convert to fraction form
    156.64/216.08 = 117.76/x
  3. Step 3: Cross multiply
    156.64x = 216.08 × 117.76
  4. Step 4: Simplify right side
    156.64x = 25,445.58
  5. Step 5: Solve for x
    x = 25,445.58/156.64
  6. Step 6: Final answer
    x = 162.45

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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.