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Finding the Fourth Proportional to 648.67, 890.65 and 631.76

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Solution

The fourth proportional to 648.67, 890.65 and 631.76 is: 867.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.67 : 890.65 = 631.76 : x
  2. Step 2: Convert to fraction form
    648.67/890.65 = 631.76/x
  3. Step 3: Cross multiply
    648.67x = 890.65 × 631.76
  4. Step 4: Simplify right side
    648.67x = 562,675.46
  5. Step 5: Solve for x
    x = 562,675.46/648.67
  6. Step 6: Final answer
    x = 867.43

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.