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Finding the Fourth Proportional to 390.00, 583.78 and 291.92

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Solution

The fourth proportional to 390.00, 583.78 and 291.92 is: 436.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.00 : 583.78 = 291.92 : x
  2. Step 2: Convert to fraction form
    390.00/583.78 = 291.92/x
  3. Step 3: Cross multiply
    390.00x = 583.78 × 291.92
  4. Step 4: Simplify right side
    390.00x = 170,414.14
  5. Step 5: Solve for x
    x = 170,414.14/390.00
  6. Step 6: Final answer
    x = 436.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.