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Finding the Fourth Proportional to 245.74, 368.70 and 142.87

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Solution

The fourth proportional to 245.74, 368.70 and 142.87 is: 214.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.74 : 368.70 = 142.87 : x
  2. Step 2: Convert to fraction form
    245.74/368.70 = 142.87/x
  3. Step 3: Cross multiply
    245.74x = 368.70 × 142.87
  4. Step 4: Simplify right side
    245.74x = 52,676.17
  5. Step 5: Solve for x
    x = 52,676.17/245.74
  6. Step 6: Final answer
    x = 214.36

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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.