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Finding the Fourth Proportional to 407.18, 561.80 and 259.97

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Solution

The fourth proportional to 407.18, 561.80 and 259.97 is: 358.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.18 : 561.80 = 259.97 : x
  2. Step 2: Convert to fraction form
    407.18/561.80 = 259.97/x
  3. Step 3: Cross multiply
    407.18x = 561.80 × 259.97
  4. Step 4: Simplify right side
    407.18x = 146,048.99
  5. Step 5: Solve for x
    x = 146,048.99/407.18
  6. Step 6: Final answer
    x = 358.68

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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.