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Finding the Fourth Proportional to 891, 1,230 and 537.12

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Solution

The fourth proportional to 891, 1,230 and 537.12 is: 741.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    891 : 1,230 = 537.12 : x
  2. Step 2: Convert to fraction form
    891/1,230 = 537.12/x
  3. Step 3: Cross multiply
    891x = 1,230 × 537.12
  4. Step 4: Simplify right side
    891x = 660,657.60
  5. Step 5: Solve for x
    x = 660,657.60/891
  6. Step 6: Final answer
    x = 741.48

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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.