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Finding the Fourth Proportional to 130.59, 180.21 and 72.37

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Solution

The fourth proportional to 130.59, 180.21 and 72.37 is: 99.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.59 : 180.21 = 72.37 : x
  2. Step 2: Convert to fraction form
    130.59/180.21 = 72.37/x
  3. Step 3: Cross multiply
    130.59x = 180.21 × 72.37
  4. Step 4: Simplify right side
    130.59x = 13,040.53
  5. Step 5: Solve for x
    x = 13,040.53/130.59
  6. Step 6: Final answer
    x = 99.86

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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.