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Finding the Fourth Proportional to 156.87, 216.59 and 100.89

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Solution

The fourth proportional to 156.87, 216.59 and 100.89 is: 139.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.87 : 216.59 = 100.89 : x
  2. Step 2: Convert to fraction form
    156.87/216.59 = 100.89/x
  3. Step 3: Cross multiply
    156.87x = 216.59 × 100.89
  4. Step 4: Simplify right side
    156.87x = 21,851.26
  5. Step 5: Solve for x
    x = 21,851.26/156.87
  6. Step 6: Final answer
    x = 139.30

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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.