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Finding the Fourth Proportional to 434.16, 650.30 and 421.88

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Solution

The fourth proportional to 434.16, 650.30 and 421.88 is: 631.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.16 : 650.30 = 421.88 : x
  2. Step 2: Convert to fraction form
    434.16/650.30 = 421.88/x
  3. Step 3: Cross multiply
    434.16x = 650.30 × 421.88
  4. Step 4: Simplify right side
    434.16x = 274,343.20
  5. Step 5: Solve for x
    x = 274,343.20/434.16
  6. Step 6: Final answer
    x = 631.89

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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.