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Finding the Fourth Proportional to 784.82, 1,176.98 and 438.32

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Solution

The fourth proportional to 784.82, 1,176.98 and 438.32 is: 657.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.82 : 1,176.98 = 438.32 : x
  2. Step 2: Convert to fraction form
    784.82/1,176.98 = 438.32/x
  3. Step 3: Cross multiply
    784.82x = 1,176.98 × 438.32
  4. Step 4: Simplify right side
    784.82x = 515,885.80
  5. Step 5: Solve for x
    x = 515,885.80/784.82
  6. Step 6: Final answer
    x = 657.33

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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.