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Finding the Fourth Proportional to 658.63, 909.63 and 438.51

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Solution

The fourth proportional to 658.63, 909.63 and 438.51 is: 605.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.63 : 909.63 = 438.51 : x
  2. Step 2: Convert to fraction form
    658.63/909.63 = 438.51/x
  3. Step 3: Cross multiply
    658.63x = 909.63 × 438.51
  4. Step 4: Simplify right side
    658.63x = 398,885.26
  5. Step 5: Solve for x
    x = 398,885.26/658.63
  6. Step 6: Final answer
    x = 605.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.