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Finding the Fourth Proportional to 920.61, 1,270.71 and 735.39

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Solution

The fourth proportional to 920.61, 1,270.71 and 735.39 is: 1,015.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.61 : 1,270.71 = 735.39 : x
  2. Step 2: Convert to fraction form
    920.61/1,270.71 = 735.39/x
  3. Step 3: Cross multiply
    920.61x = 1,270.71 × 735.39
  4. Step 4: Simplify right side
    920.61x = 934,467.43
  5. Step 5: Solve for x
    x = 934,467.43/920.61
  6. Step 6: Final answer
    x = 1,015.05

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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.