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Finding the Fourth Proportional to 417.48, 575.40 and 347.40

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Solution

The fourth proportional to 417.48, 575.40 and 347.40 is: 478.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.48 : 575.40 = 347.40 : x
  2. Step 2: Convert to fraction form
    417.48/575.40 = 347.40/x
  3. Step 3: Cross multiply
    417.48x = 575.40 × 347.40
  4. Step 4: Simplify right side
    417.48x = 199,893.96
  5. Step 5: Solve for x
    x = 199,893.96/417.48
  6. Step 6: Final answer
    x = 478.81

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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.