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Finding the Fourth Proportional to 420.60, 581.10 and 346.20

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Solution

The fourth proportional to 420.60, 581.10 and 346.20 is: 478.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.60 : 581.10 = 346.20 : x
  2. Step 2: Convert to fraction form
    420.60/581.10 = 346.20/x
  3. Step 3: Cross multiply
    420.60x = 581.10 × 346.20
  4. Step 4: Simplify right side
    420.60x = 201,176.82
  5. Step 5: Solve for x
    x = 201,176.82/420.60
  6. Step 6: Final answer
    x = 478.31

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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.