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Finding the Fourth Proportional to 1,376.40, 2,064.60 and 645.12

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Solution

The fourth proportional to 1,376.40, 2,064.60 and 645.12 is: 967.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.40 : 2,064.60 = 645.12 : x
  2. Step 2: Convert to fraction form
    1,376.40/2,064.60 = 645.12/x
  3. Step 3: Cross multiply
    1,376.40x = 2,064.60 × 645.12
  4. Step 4: Simplify right side
    1,376.40x = 1,331,914.75
  5. Step 5: Solve for x
    x = 1,331,914.75/1,376.40
  6. Step 6: Final answer
    x = 967.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.