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Finding the Fourth Proportional to 743.69, 1,025.88 and 690.90

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Solution

The fourth proportional to 743.69, 1,025.88 and 690.90 is: 953.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.69 : 1,025.88 = 690.90 : x
  2. Step 2: Convert to fraction form
    743.69/1,025.88 = 690.90/x
  3. Step 3: Cross multiply
    743.69x = 1,025.88 × 690.90
  4. Step 4: Simplify right side
    743.69x = 708,780.49
  5. Step 5: Solve for x
    x = 708,780.49/743.69
  6. Step 6: Final answer
    x = 953.07

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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.