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Finding the Fourth Proportional to 1,140, 1,572.76 and 667.48

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Solution

The fourth proportional to 1,140, 1,572.76 and 667.48 is: 920.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140 : 1,572.76 = 667.48 : x
  2. Step 2: Convert to fraction form
    1,140/1,572.76 = 667.48/x
  3. Step 3: Cross multiply
    1,140x = 1,572.76 × 667.48
  4. Step 4: Simplify right side
    1,140x = 1,049,785.84
  5. Step 5: Solve for x
    x = 1,049,785.84/1,140
  6. Step 6: Final answer
    x = 920.86

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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.