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Finding the Fourth Proportional to 918.43, 1,267.45 and 498.79

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Solution

The fourth proportional to 918.43, 1,267.45 and 498.79 is: 688.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.43 : 1,267.45 = 498.79 : x
  2. Step 2: Convert to fraction form
    918.43/1,267.45 = 498.79/x
  3. Step 3: Cross multiply
    918.43x = 1,267.45 × 498.79
  4. Step 4: Simplify right side
    918.43x = 632,185.72
  5. Step 5: Solve for x
    x = 632,185.72/918.43
  6. Step 6: Final answer
    x = 688.33

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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.