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Finding the Fourth Proportional to 420.98, 581.18 and 296.75

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Solution

The fourth proportional to 420.98, 581.18 and 296.75 is: 409.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.98 : 581.18 = 296.75 : x
  2. Step 2: Convert to fraction form
    420.98/581.18 = 296.75/x
  3. Step 3: Cross multiply
    420.98x = 581.18 × 296.75
  4. Step 4: Simplify right side
    420.98x = 172,460.78
  5. Step 5: Solve for x
    x = 172,460.78/420.98
  6. Step 6: Final answer
    x = 409.67

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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.