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Finding the Fourth Proportional to 103.61, 156.40 and 102.53

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Solution

The fourth proportional to 103.61, 156.40 and 102.53 is: 154.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.61 : 156.40 = 102.53 : x
  2. Step 2: Convert to fraction form
    103.61/156.40 = 102.53/x
  3. Step 3: Cross multiply
    103.61x = 156.40 × 102.53
  4. Step 4: Simplify right side
    103.61x = 16,035.69
  5. Step 5: Solve for x
    x = 16,035.69/103.61
  6. Step 6: Final answer
    x = 154.77

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.