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Finding the Fourth Proportional to 821.75, 1,134.02 and 453.75

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Solution

The fourth proportional to 821.75, 1,134.02 and 453.75 is: 626.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.75 : 1,134.02 = 453.75 : x
  2. Step 2: Convert to fraction form
    821.75/1,134.02 = 453.75/x
  3. Step 3: Cross multiply
    821.75x = 1,134.02 × 453.75
  4. Step 4: Simplify right side
    821.75x = 514,561.58
  5. Step 5: Solve for x
    x = 514,561.58/821.75
  6. Step 6: Final answer
    x = 626.18

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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.