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Finding the Fourth Proportional to 420.40, 580.06 and 270.76

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Solution

The fourth proportional to 420.40, 580.06 and 270.76 is: 373.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.40 : 580.06 = 270.76 : x
  2. Step 2: Convert to fraction form
    420.40/580.06 = 270.76/x
  3. Step 3: Cross multiply
    420.40x = 580.06 × 270.76
  4. Step 4: Simplify right side
    420.40x = 157,052.79
  5. Step 5: Solve for x
    x = 157,052.79/420.40
  6. Step 6: Final answer
    x = 373.58

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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.