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Finding the Fourth Proportional to 420.69, 580.98 and 374.85

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Solution

The fourth proportional to 420.69, 580.98 and 374.85 is: 517.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.69 : 580.98 = 374.85 : x
  2. Step 2: Convert to fraction form
    420.69/580.98 = 374.85/x
  3. Step 3: Cross multiply
    420.69x = 580.98 × 374.85
  4. Step 4: Simplify right side
    420.69x = 217,780.35
  5. Step 5: Solve for x
    x = 217,780.35/420.69
  6. Step 6: Final answer
    x = 517.67

Related Problems

Find fourth proportional to 210.35, 290.49 and 187.43
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Double scale
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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.