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Finding the Fourth Proportional to 999.49, 1,378.40 and 626.51

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Solution

The fourth proportional to 999.49, 1,378.40 and 626.51 is: 864.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.49 : 1,378.40 = 626.51 : x
  2. Step 2: Convert to fraction form
    999.49/1,378.40 = 626.51/x
  3. Step 3: Cross multiply
    999.49x = 1,378.40 × 626.51
  4. Step 4: Simplify right side
    999.49x = 863,586.40
  5. Step 5: Solve for x
    x = 863,586.40/999.49
  6. Step 6: Final answer
    x = 864.03

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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.