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Finding the Fourth Proportional to 1,585.46, 2,378.46 and 719.78

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Solution

The fourth proportional to 1,585.46, 2,378.46 and 719.78 is: 1,079.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.46 : 2,378.46 = 719.78 : x
  2. Step 2: Convert to fraction form
    1,585.46/2,378.46 = 719.78/x
  3. Step 3: Cross multiply
    1,585.46x = 2,378.46 × 719.78
  4. Step 4: Simplify right side
    1,585.46x = 1,711,967.94
  5. Step 5: Solve for x
    x = 1,711,967.94/1,585.46
  6. Step 6: Final answer
    x = 1,079.79

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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.