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Finding the Fourth Proportional to 145.12, 216.50 and 130.54

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Solution

The fourth proportional to 145.12, 216.50 and 130.54 is: 194.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.12 : 216.50 = 130.54 : x
  2. Step 2: Convert to fraction form
    145.12/216.50 = 130.54/x
  3. Step 3: Cross multiply
    145.12x = 216.50 × 130.54
  4. Step 4: Simplify right side
    145.12x = 28,260.88
  5. Step 5: Solve for x
    x = 28,260.88/145.12
  6. Step 6: Final answer
    x = 194.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.