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Finding the Fourth Proportional to 420.51, 631.03 and 266.23

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Solution

The fourth proportional to 420.51, 631.03 and 266.23 is: 399.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.51 : 631.03 = 266.23 : x
  2. Step 2: Convert to fraction form
    420.51/631.03 = 266.23/x
  3. Step 3: Cross multiply
    420.51x = 631.03 × 266.23
  4. Step 4: Simplify right side
    420.51x = 167,999.12
  5. Step 5: Solve for x
    x = 167,999.12/420.51
  6. Step 6: Final answer
    x = 399.51

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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.