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Finding the Fourth Proportional to 358.90, 538.75 and 142.63

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Solution

The fourth proportional to 358.90, 538.75 and 142.63 is: 214.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.90 : 538.75 = 142.63 : x
  2. Step 2: Convert to fraction form
    358.90/538.75 = 142.63/x
  3. Step 3: Cross multiply
    358.90x = 538.75 × 142.63
  4. Step 4: Simplify right side
    358.90x = 76,840.74
  5. Step 5: Solve for x
    x = 76,840.74/358.90
  6. Step 6: Final answer
    x = 214.10

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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.