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Finding the Fourth Proportional to 1,039.29, 1,433.90 and 666.69

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Solution

The fourth proportional to 1,039.29, 1,433.90 and 666.69 is: 919.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.29 : 1,433.90 = 666.69 : x
  2. Step 2: Convert to fraction form
    1,039.29/1,433.90 = 666.69/x
  3. Step 3: Cross multiply
    1,039.29x = 1,433.90 × 666.69
  4. Step 4: Simplify right side
    1,039.29x = 955,963.46
  5. Step 5: Solve for x
    x = 955,963.46/1,039.29
  6. Step 6: Final answer
    x = 919.82

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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.