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Finding the Fourth Proportional to 726.96, 1,004.40 and 644.16

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Solution

The fourth proportional to 726.96, 1,004.40 and 644.16 is: 890.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.96 : 1,004.40 = 644.16 : x
  2. Step 2: Convert to fraction form
    726.96/1,004.40 = 644.16/x
  3. Step 3: Cross multiply
    726.96x = 1,004.40 × 644.16
  4. Step 4: Simplify right side
    726.96x = 646,994.30
  5. Step 5: Solve for x
    x = 646,994.30/726.96
  6. Step 6: Final answer
    x = 890.00

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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.