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Finding the Fourth Proportional to 1,051.40, 1,451.90 and 679.02

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Solution

The fourth proportional to 1,051.40, 1,451.90 and 679.02 is: 937.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,051.40 : 1,451.90 = 679.02 : x
  2. Step 2: Convert to fraction form
    1,051.40/1,451.90 = 679.02/x
  3. Step 3: Cross multiply
    1,051.40x = 1,451.90 × 679.02
  4. Step 4: Simplify right side
    1,051.40x = 985,869.14
  5. Step 5: Solve for x
    x = 985,869.14/1,051.40
  6. Step 6: Final answer
    x = 937.67

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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.