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Finding the Fourth Proportional to 741.12, 1,023.36 and 625.28

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Solution

The fourth proportional to 741.12, 1,023.36 and 625.28 is: 863.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.12 : 1,023.36 = 625.28 : x
  2. Step 2: Convert to fraction form
    741.12/1,023.36 = 625.28/x
  3. Step 3: Cross multiply
    741.12x = 1,023.36 × 625.28
  4. Step 4: Simplify right side
    741.12x = 639,886.54
  5. Step 5: Solve for x
    x = 639,886.54/741.12
  6. Step 6: Final answer
    x = 863.40

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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.