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Finding the Fourth Proportional to 756.64, 1,140.76 and 687.52

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Solution

The fourth proportional to 756.64, 1,140.76 and 687.52 is: 1,036.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.64 : 1,140.76 = 687.52 : x
  2. Step 2: Convert to fraction form
    756.64/1,140.76 = 687.52/x
  3. Step 3: Cross multiply
    756.64x = 1,140.76 × 687.52
  4. Step 4: Simplify right side
    756.64x = 784,295.32
  5. Step 5: Solve for x
    x = 784,295.32/756.64
  6. Step 6: Final answer
    x = 1,036.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.