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Finding the Fourth Proportional to 920.03, 1,378.60 and 782.51

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Solution

The fourth proportional to 920.03, 1,378.60 and 782.51 is: 1,172.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.03 : 1,378.60 = 782.51 : x
  2. Step 2: Convert to fraction form
    920.03/1,378.60 = 782.51/x
  3. Step 3: Cross multiply
    920.03x = 1,378.60 × 782.51
  4. Step 4: Simplify right side
    920.03x = 1,078,768.29
  5. Step 5: Solve for x
    x = 1,078,768.29/920.03
  6. Step 6: Final answer
    x = 1,172.54

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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.