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Finding the Fourth Proportional to 438.14, 657.45 and 245.78

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Solution

The fourth proportional to 438.14, 657.45 and 245.78 is: 368.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.14 : 657.45 = 245.78 : x
  2. Step 2: Convert to fraction form
    438.14/657.45 = 245.78/x
  3. Step 3: Cross multiply
    438.14x = 657.45 × 245.78
  4. Step 4: Simplify right side
    438.14x = 161,588.06
  5. Step 5: Solve for x
    x = 161,588.06/438.14
  6. Step 6: Final answer
    x = 368.80

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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.