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Finding the Fourth Proportional to 1,027.20, 1,417.20 and 673.28

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Solution

The fourth proportional to 1,027.20, 1,417.20 and 673.28 is: 928.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,027.20 : 1,417.20 = 673.28 : x
  2. Step 2: Convert to fraction form
    1,027.20/1,417.20 = 673.28/x
  3. Step 3: Cross multiply
    1,027.20x = 1,417.20 × 673.28
  4. Step 4: Simplify right side
    1,027.20x = 954,172.42
  5. Step 5: Solve for x
    x = 954,172.42/1,027.20
  6. Step 6: Final answer
    x = 928.91

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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.