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Finding the Fourth Proportional to 832.90, 1,246.65 and 649.30

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Solution

The fourth proportional to 832.90, 1,246.65 and 649.30 is: 971.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    832.90 : 1,246.65 = 649.30 : x
  2. Step 2: Convert to fraction form
    832.90/1,246.65 = 649.30/x
  3. Step 3: Cross multiply
    832.90x = 1,246.65 × 649.30
  4. Step 4: Simplify right side
    832.90x = 809,449.85
  5. Step 5: Solve for x
    x = 809,449.85/832.90
  6. Step 6: Final answer
    x = 971.85

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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.