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Finding the Fourth Proportional to 1,153.20, 1,591.20 and 711.48

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Solution

The fourth proportional to 1,153.20, 1,591.20 and 711.48 is: 981.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.20 : 1,591.20 = 711.48 : x
  2. Step 2: Convert to fraction form
    1,153.20/1,591.20 = 711.48/x
  3. Step 3: Cross multiply
    1,153.20x = 1,591.20 × 711.48
  4. Step 4: Simplify right side
    1,153.20x = 1,132,106.98
  5. Step 5: Solve for x
    x = 1,132,106.98/1,153.20
  6. Step 6: Final answer
    x = 981.71

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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.