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Finding the Fourth Proportional to 407.41, 561.47 and 289.39

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Solution

The fourth proportional to 407.41, 561.47 and 289.39 is: 398.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.41 : 561.47 = 289.39 : x
  2. Step 2: Convert to fraction form
    407.41/561.47 = 289.39/x
  3. Step 3: Cross multiply
    407.41x = 561.47 × 289.39
  4. Step 4: Simplify right side
    407.41x = 162,482.65
  5. Step 5: Solve for x
    x = 162,482.65/407.41
  6. Step 6: Final answer
    x = 398.82

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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.