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Finding the Fourth Proportional to 1,139.04, 1,571.92 and 666.99

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Solution

The fourth proportional to 1,139.04, 1,571.92 and 666.99 is: 920.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.04 : 1,571.92 = 666.99 : x
  2. Step 2: Convert to fraction form
    1,139.04/1,571.92 = 666.99/x
  3. Step 3: Cross multiply
    1,139.04x = 1,571.92 × 666.99
  4. Step 4: Simplify right side
    1,139.04x = 1,048,453.25
  5. Step 5: Solve for x
    x = 1,048,453.25/1,139.04
  6. Step 6: Final answer
    x = 920.47

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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.