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Finding the Fourth Proportional to 421.98, 581.00 and 348.18

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Solution

The fourth proportional to 421.98, 581.00 and 348.18 is: 479.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.98 : 581.00 = 348.18 : x
  2. Step 2: Convert to fraction form
    421.98/581.00 = 348.18/x
  3. Step 3: Cross multiply
    421.98x = 581.00 × 348.18
  4. Step 4: Simplify right side
    421.98x = 202,290.84
  5. Step 5: Solve for x
    x = 202,290.84/421.98
  6. Step 6: Final answer
    x = 479.38

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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.