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Finding the Fourth Proportional to 345.64, 518.48 and 140.17

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Solution

The fourth proportional to 345.64, 518.48 and 140.17 is: 210.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.64 : 518.48 = 140.17 : x
  2. Step 2: Convert to fraction form
    345.64/518.48 = 140.17/x
  3. Step 3: Cross multiply
    345.64x = 518.48 × 140.17
  4. Step 4: Simplify right side
    345.64x = 72,675.34
  5. Step 5: Solve for x
    x = 72,675.34/345.64
  6. Step 6: Final answer
    x = 210.26

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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.