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Finding the Fourth Proportional to 712.40, 1,069.68 and 454.04

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Solution

The fourth proportional to 712.40, 1,069.68 and 454.04 is: 681.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.40 : 1,069.68 = 454.04 : x
  2. Step 2: Convert to fraction form
    712.40/1,069.68 = 454.04/x
  3. Step 3: Cross multiply
    712.40x = 1,069.68 × 454.04
  4. Step 4: Simplify right side
    712.40x = 485,677.51
  5. Step 5: Solve for x
    x = 485,677.51/712.40
  6. Step 6: Final answer
    x = 681.75

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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.