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Finding the Fourth Proportional to 421.16, 581.16 and 253.16

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Solution

The fourth proportional to 421.16, 581.16 and 253.16 is: 349.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.16 : 581.16 = 253.16 : x
  2. Step 2: Convert to fraction form
    421.16/581.16 = 253.16/x
  3. Step 3: Cross multiply
    421.16x = 581.16 × 253.16
  4. Step 4: Simplify right side
    421.16x = 147,126.47
  5. Step 5: Solve for x
    x = 147,126.47/421.16
  6. Step 6: Final answer
    x = 349.34

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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.