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Finding the Fourth Proportional to 1,039.50, 1,433.90 and 646.65

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Solution

The fourth proportional to 1,039.50, 1,433.90 and 646.65 is: 892.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.50 : 1,433.90 = 646.65 : x
  2. Step 2: Convert to fraction form
    1,039.50/1,433.90 = 646.65/x
  3. Step 3: Cross multiply
    1,039.50x = 1,433.90 × 646.65
  4. Step 4: Simplify right side
    1,039.50x = 927,233.05
  5. Step 5: Solve for x
    x = 927,233.05/1,039.50
  6. Step 6: Final answer
    x = 892.00

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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.