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Finding the Fourth Proportional to 661.68, 910.44 and 644.72

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Solution

The fourth proportional to 661.68, 910.44 and 644.72 is: 887.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.68 : 910.44 = 644.72 : x
  2. Step 2: Convert to fraction form
    661.68/910.44 = 644.72/x
  3. Step 3: Cross multiply
    661.68x = 910.44 × 644.72
  4. Step 4: Simplify right side
    661.68x = 586,978.88
  5. Step 5: Solve for x
    x = 586,978.88/661.68
  6. Step 6: Final answer
    x = 887.10

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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.