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Finding the Fourth Proportional to 672.64, 1,009.08 and 577.12

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Solution

The fourth proportional to 672.64, 1,009.08 and 577.12 is: 865.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.64 : 1,009.08 = 577.12 : x
  2. Step 2: Convert to fraction form
    672.64/1,009.08 = 577.12/x
  3. Step 3: Cross multiply
    672.64x = 1,009.08 × 577.12
  4. Step 4: Simplify right side
    672.64x = 582,360.25
  5. Step 5: Solve for x
    x = 582,360.25/672.64
  6. Step 6: Final answer
    x = 865.78

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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.