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Finding the Fourth Proportional to 838.89, 1,157.50 and 479.94

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Solution

The fourth proportional to 838.89, 1,157.50 and 479.94 is: 662.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.89 : 1,157.50 = 479.94 : x
  2. Step 2: Convert to fraction form
    838.89/1,157.50 = 479.94/x
  3. Step 3: Cross multiply
    838.89x = 1,157.50 × 479.94
  4. Step 4: Simplify right side
    838.89x = 555,530.55
  5. Step 5: Solve for x
    x = 555,530.55/838.89
  6. Step 6: Final answer
    x = 662.22

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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.