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Finding the Fourth Proportional to 1,071.57, 1,478.87 and 673.53

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Solution

The fourth proportional to 1,071.57, 1,478.87 and 673.53 is: 929.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.57 : 1,478.87 = 673.53 : x
  2. Step 2: Convert to fraction form
    1,071.57/1,478.87 = 673.53/x
  3. Step 3: Cross multiply
    1,071.57x = 1,478.87 × 673.53
  4. Step 4: Simplify right side
    1,071.57x = 996,070.88
  5. Step 5: Solve for x
    x = 996,070.88/1,071.57
  6. Step 6: Final answer
    x = 929.54

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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.