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Finding the Fourth Proportional to 827.60, 1,140.62 and 687.74

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Solution

The fourth proportional to 827.60, 1,140.62 and 687.74 is: 947.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.60 : 1,140.62 = 687.74 : x
  2. Step 2: Convert to fraction form
    827.60/1,140.62 = 687.74/x
  3. Step 3: Cross multiply
    827.60x = 1,140.62 × 687.74
  4. Step 4: Simplify right side
    827.60x = 784,440.86
  5. Step 5: Solve for x
    x = 784,440.86/827.60
  6. Step 6: Final answer
    x = 947.86

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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.