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Finding the Fourth Proportional to 920.47, 1,270.20 and 547.44

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Solution

The fourth proportional to 920.47, 1,270.20 and 547.44 is: 755.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.47 : 1,270.20 = 547.44 : x
  2. Step 2: Convert to fraction form
    920.47/1,270.20 = 547.44/x
  3. Step 3: Cross multiply
    920.47x = 1,270.20 × 547.44
  4. Step 4: Simplify right side
    920.47x = 695,362.83
  5. Step 5: Solve for x
    x = 695,362.83/920.47
  6. Step 6: Final answer
    x = 755.44

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Double scale
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1.5x scale

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.