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Finding the Fourth Proportional to 1,130.15, 1,561.08 and 871.37

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Solution

The fourth proportional to 1,130.15, 1,561.08 and 871.37 is: 1,203.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.15 : 1,561.08 = 871.37 : x
  2. Step 2: Convert to fraction form
    1,130.15/1,561.08 = 871.37/x
  3. Step 3: Cross multiply
    1,130.15x = 1,561.08 × 871.37
  4. Step 4: Simplify right side
    1,130.15x = 1,360,278.28
  5. Step 5: Solve for x
    x = 1,360,278.28/1,130.15
  6. Step 6: Final answer
    x = 1,203.63

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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.