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Finding the Fourth Proportional to 760.80, 1,141.74 and 687.36

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Solution

The fourth proportional to 760.80, 1,141.74 and 687.36 is: 1,031.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.80 : 1,141.74 = 687.36 : x
  2. Step 2: Convert to fraction form
    760.80/1,141.74 = 687.36/x
  3. Step 3: Cross multiply
    760.80x = 1,141.74 × 687.36
  4. Step 4: Simplify right side
    760.80x = 784,786.41
  5. Step 5: Solve for x
    x = 784,786.41/760.80
  6. Step 6: Final answer
    x = 1,031.53

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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.