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Finding the Fourth Proportional to 407.30, 561.85 and 283.37

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Solution

The fourth proportional to 407.30, 561.85 and 283.37 is: 390.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.30 : 561.85 = 283.37 : x
  2. Step 2: Convert to fraction form
    407.30/561.85 = 283.37/x
  3. Step 3: Cross multiply
    407.30x = 561.85 × 283.37
  4. Step 4: Simplify right side
    407.30x = 159,207.92
  5. Step 5: Solve for x
    x = 159,207.92/407.30
  6. Step 6: Final answer
    x = 390.89

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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.