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Finding the Fourth Proportional to 1,586.71, 2,380.47 and 661.79

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Solution

The fourth proportional to 1,586.71, 2,380.47 and 661.79 is: 992.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,586.71 : 2,380.47 = 661.79 : x
  2. Step 2: Convert to fraction form
    1,586.71/2,380.47 = 661.79/x
  3. Step 3: Cross multiply
    1,586.71x = 2,380.47 × 661.79
  4. Step 4: Simplify right side
    1,586.71x = 1,575,374.71
  5. Step 5: Solve for x
    x = 1,575,374.71/1,586.71
  6. Step 6: Final answer
    x = 992.86

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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.