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Finding the Fourth Proportional to 1,123.99, 1,551.21 and 626.74

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Solution

The fourth proportional to 1,123.99, 1,551.21 and 626.74 is: 864.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.99 : 1,551.21 = 626.74 : x
  2. Step 2: Convert to fraction form
    1,123.99/1,551.21 = 626.74/x
  3. Step 3: Cross multiply
    1,123.99x = 1,551.21 × 626.74
  4. Step 4: Simplify right side
    1,123.99x = 972,205.36
  5. Step 5: Solve for x
    x = 972,205.36/1,123.99
  6. Step 6: Final answer
    x = 864.96

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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.