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Finding the Fourth Proportional to 959.58, 1,438.21 and 438.87

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Solution

The fourth proportional to 959.58, 1,438.21 and 438.87 is: 657.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.58 : 1,438.21 = 438.87 : x
  2. Step 2: Convert to fraction form
    959.58/1,438.21 = 438.87/x
  3. Step 3: Cross multiply
    959.58x = 1,438.21 × 438.87
  4. Step 4: Simplify right side
    959.58x = 631,187.22
  5. Step 5: Solve for x
    x = 631,187.22/959.58
  6. Step 6: Final answer
    x = 657.77

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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.