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Finding the Fourth Proportional to 1,586.32, 2,379.48 and 661.30

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Solution

The fourth proportional to 1,586.32, 2,379.48 and 661.30 is: 991.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,586.32 : 2,379.48 = 661.30 : x
  2. Step 2: Convert to fraction form
    1,586.32/2,379.48 = 661.30/x
  3. Step 3: Cross multiply
    1,586.32x = 2,379.48 × 661.30
  4. Step 4: Simplify right side
    1,586.32x = 1,573,550.12
  5. Step 5: Solve for x
    x = 1,573,550.12/1,586.32
  6. Step 6: Final answer
    x = 991.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.