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Finding the Fourth Proportional to 838.79, 1,157.45 and 479.89

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Solution

The fourth proportional to 838.79, 1,157.45 and 479.89 is: 662.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.79 : 1,157.45 = 479.89 : x
  2. Step 2: Convert to fraction form
    838.79/1,157.45 = 479.89/x
  3. Step 3: Cross multiply
    838.79x = 1,157.45 × 479.89
  4. Step 4: Simplify right side
    838.79x = 555,442.89
  5. Step 5: Solve for x
    x = 555,442.89/838.79
  6. Step 6: Final answer
    x = 662.20

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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.