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Finding the Fourth Proportional to 145.32, 216.86 and 129.94

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Solution

The fourth proportional to 145.32, 216.86 and 129.94 is: 193.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.32 : 216.86 = 129.94 : x
  2. Step 2: Convert to fraction form
    145.32/216.86 = 129.94/x
  3. Step 3: Cross multiply
    145.32x = 216.86 × 129.94
  4. Step 4: Simplify right side
    145.32x = 28,178.79
  5. Step 5: Solve for x
    x = 28,178.79/145.32
  6. Step 6: Final answer
    x = 193.91

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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.