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Finding the Fourth Proportional to 434.31, 651.46 and 145.74

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Solution

The fourth proportional to 434.31, 651.46 and 145.74 is: 218.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.31 : 651.46 = 145.74 : x
  2. Step 2: Convert to fraction form
    434.31/651.46 = 145.74/x
  3. Step 3: Cross multiply
    434.31x = 651.46 × 145.74
  4. Step 4: Simplify right side
    434.31x = 94,943.78
  5. Step 5: Solve for x
    x = 94,943.78/434.31
  6. Step 6: Final answer
    x = 218.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.