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Finding the Fourth Proportional to 921.07, 1,270.65 and 547.84

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Solution

The fourth proportional to 921.07, 1,270.65 and 547.84 is: 755.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.07 : 1,270.65 = 547.84 : x
  2. Step 2: Convert to fraction form
    921.07/1,270.65 = 547.84/x
  3. Step 3: Cross multiply
    921.07x = 1,270.65 × 547.84
  4. Step 4: Simplify right side
    921.07x = 696,112.90
  5. Step 5: Solve for x
    x = 696,112.90/921.07
  6. Step 6: Final answer
    x = 755.77

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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.