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Finding the Fourth Proportional to 130.53, 180.16 and 80.75

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Solution

The fourth proportional to 130.53, 180.16 and 80.75 is: 111.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.53 : 180.16 = 80.75 : x
  2. Step 2: Convert to fraction form
    130.53/180.16 = 80.75/x
  3. Step 3: Cross multiply
    130.53x = 180.16 × 80.75
  4. Step 4: Simplify right side
    130.53x = 14,547.92
  5. Step 5: Solve for x
    x = 14,547.92/130.53
  6. Step 6: Final answer
    x = 111.45

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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.