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Finding the Fourth Proportional to 421.16, 581.27 and 316.77

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Solution

The fourth proportional to 421.16, 581.27 and 316.77 is: 437.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.16 : 581.27 = 316.77 : x
  2. Step 2: Convert to fraction form
    421.16/581.27 = 316.77/x
  3. Step 3: Cross multiply
    421.16x = 581.27 × 316.77
  4. Step 4: Simplify right side
    421.16x = 184,126.03
  5. Step 5: Solve for x
    x = 184,126.03/421.16
  6. Step 6: Final answer
    x = 437.19

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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.