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Finding the Fourth Proportional to 427.45, 590.64 and 390.10

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Solution

The fourth proportional to 427.45, 590.64 and 390.10 is: 539.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.45 : 590.64 = 390.10 : x
  2. Step 2: Convert to fraction form
    427.45/590.64 = 390.10/x
  3. Step 3: Cross multiply
    427.45x = 590.64 × 390.10
  4. Step 4: Simplify right side
    427.45x = 230,408.66
  5. Step 5: Solve for x
    x = 230,408.66/427.45
  6. Step 6: Final answer
    x = 539.03

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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.