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Finding the Fourth Proportional to 921.30, 1,270.55 and 685.83

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Solution

The fourth proportional to 921.30, 1,270.55 and 685.83 is: 945.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.30 : 1,270.55 = 685.83 : x
  2. Step 2: Convert to fraction form
    921.30/1,270.55 = 685.83/x
  3. Step 3: Cross multiply
    921.30x = 1,270.55 × 685.83
  4. Step 4: Simplify right side
    921.30x = 871,382.64
  5. Step 5: Solve for x
    x = 871,382.64/921.30
  6. Step 6: Final answer
    x = 945.82

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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.