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Finding the Fourth Proportional to 553.59, 829.45 and 390.48

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Solution

The fourth proportional to 553.59, 829.45 and 390.48 is: 585.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.59 : 829.45 = 390.48 : x
  2. Step 2: Convert to fraction form
    553.59/829.45 = 390.48/x
  3. Step 3: Cross multiply
    553.59x = 829.45 × 390.48
  4. Step 4: Simplify right side
    553.59x = 323,883.64
  5. Step 5: Solve for x
    x = 323,883.64/553.59
  6. Step 6: Final answer
    x = 585.06

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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.