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Finding the Fourth Proportional to 1,039.89, 1,434.69 and 666.84

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Solution

The fourth proportional to 1,039.89, 1,434.69 and 666.84 is: 920.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.89 : 1,434.69 = 666.84 : x
  2. Step 2: Convert to fraction form
    1,039.89/1,434.69 = 666.84/x
  3. Step 3: Cross multiply
    1,039.89x = 1,434.69 × 666.84
  4. Step 4: Simplify right side
    1,039.89x = 956,708.68
  5. Step 5: Solve for x
    x = 956,708.68/1,039.89
  6. Step 6: Final answer
    x = 920.01

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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.