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Finding the Fourth Proportional to 340.74, 511.19 and 145.74

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Solution

The fourth proportional to 340.74, 511.19 and 145.74 is: 218.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.74 : 511.19 = 145.74 : x
  2. Step 2: Convert to fraction form
    340.74/511.19 = 145.74/x
  3. Step 3: Cross multiply
    340.74x = 511.19 × 145.74
  4. Step 4: Simplify right side
    340.74x = 74,500.10
  5. Step 5: Solve for x
    x = 74,500.10/340.74
  6. Step 6: Final answer
    x = 218.64

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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.