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Finding the Fourth Proportional to 1,120.74, 1,681.10 and 427.28

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Solution

The fourth proportional to 1,120.74, 1,681.10 and 427.28 is: 640.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.74 : 1,681.10 = 427.28 : x
  2. Step 2: Convert to fraction form
    1,120.74/1,681.10 = 427.28/x
  3. Step 3: Cross multiply
    1,120.74x = 1,681.10 × 427.28
  4. Step 4: Simplify right side
    1,120.74x = 718,293.87
  5. Step 5: Solve for x
    x = 718,293.87/1,120.74
  6. Step 6: Final answer
    x = 640.91

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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.