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Finding the Fourth Proportional to 1,322.92, 1,984.56 and 457

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Solution

The fourth proportional to 1,322.92, 1,984.56 and 457 is: 685.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.92 : 1,984.56 = 457 : x
  2. Step 2: Convert to fraction form
    1,322.92/1,984.56 = 457/x
  3. Step 3: Cross multiply
    1,322.92x = 1,984.56 × 457
  4. Step 4: Simplify right side
    1,322.92x = 906,943.92
  5. Step 5: Solve for x
    x = 906,943.92/1,322.92
  6. Step 6: Final answer
    x = 685.56

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Double scale
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1.5x scale

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.