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Finding the Fourth Proportional to 102.53, 142.07 and 100.37

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Solution

The fourth proportional to 102.53, 142.07 and 100.37 is: 139.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.53 : 142.07 = 100.37 : x
  2. Step 2: Convert to fraction form
    102.53/142.07 = 100.37/x
  3. Step 3: Cross multiply
    102.53x = 142.07 × 100.37
  4. Step 4: Simplify right side
    102.53x = 14,259.57
  5. Step 5: Solve for x
    x = 14,259.57/102.53
  6. Step 6: Final answer
    x = 139.08

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.