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Finding the Fourth Proportional to 156.17, 215.61 and 151.40

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Solution

The fourth proportional to 156.17, 215.61 and 151.40 is: 209.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.17 : 215.61 = 151.40 : x
  2. Step 2: Convert to fraction form
    156.17/215.61 = 151.40/x
  3. Step 3: Cross multiply
    156.17x = 215.61 × 151.40
  4. Step 4: Simplify right side
    156.17x = 32,642.28
  5. Step 5: Solve for x
    x = 32,642.28/156.17
  6. Step 6: Final answer
    x = 209.02

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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.