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Finding the Fourth Proportional to 407.12, 561.92 and 283.04

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Solution

The fourth proportional to 407.12, 561.92 and 283.04 is: 390.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.12 : 561.92 = 283.04 : x
  2. Step 2: Convert to fraction form
    407.12/561.92 = 283.04/x
  3. Step 3: Cross multiply
    407.12x = 561.92 × 283.04
  4. Step 4: Simplify right side
    407.12x = 159,045.84
  5. Step 5: Solve for x
    x = 159,045.84/407.12
  6. Step 6: Final answer
    x = 390.66

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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.