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Finding the Fourth Proportional to 1,133.80, 1,564.74 and 871.32

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Solution

The fourth proportional to 1,133.80, 1,564.74 and 871.32 is: 1,202.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,133.80 : 1,564.74 = 871.32 : x
  2. Step 2: Convert to fraction form
    1,133.80/1,564.74 = 871.32/x
  3. Step 3: Cross multiply
    1,133.80x = 1,564.74 × 871.32
  4. Step 4: Simplify right side
    1,133.80x = 1,363,389.26
  5. Step 5: Solve for x
    x = 1,363,389.26/1,133.80
  6. Step 6: Final answer
    x = 1,202.50

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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.