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Finding the Fourth Proportional to 421.80, 631.67 and 291.45

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Solution

The fourth proportional to 421.80, 631.67 and 291.45 is: 436.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.80 : 631.67 = 291.45 : x
  2. Step 2: Convert to fraction form
    421.80/631.67 = 291.45/x
  3. Step 3: Cross multiply
    421.80x = 631.67 × 291.45
  4. Step 4: Simplify right side
    421.80x = 184,102.70
  5. Step 5: Solve for x
    x = 184,102.70/421.80
  6. Step 6: Final answer
    x = 436.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.