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Finding the Fourth Proportional to 156.00, 215.28 and 100.74

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Solution

The fourth proportional to 156.00, 215.28 and 100.74 is: 139.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.00 : 215.28 = 100.74 : x
  2. Step 2: Convert to fraction form
    156.00/215.28 = 100.74/x
  3. Step 3: Cross multiply
    156.00x = 215.28 × 100.74
  4. Step 4: Simplify right side
    156.00x = 21,688.11
  5. Step 5: Solve for x
    x = 21,688.11/156.00
  6. Step 6: Final answer
    x = 139.02

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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.