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Finding the Fourth Proportional to 1,565.20, 2,159.90 and 866.56

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Solution

The fourth proportional to 1,565.20, 2,159.90 and 866.56 is: 1,195.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,565.20 : 2,159.90 = 866.56 : x
  2. Step 2: Convert to fraction form
    1,565.20/2,159.90 = 866.56/x
  3. Step 3: Cross multiply
    1,565.20x = 2,159.90 × 866.56
  4. Step 4: Simplify right side
    1,565.20x = 1,871,682.94
  5. Step 5: Solve for x
    x = 1,871,682.94/1,565.20
  6. Step 6: Final answer
    x = 1,195.81

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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.