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Finding the Fourth Proportional to 760.55, 1,141.37 and 687.11

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Solution

The fourth proportional to 760.55, 1,141.37 and 687.11 is: 1,031.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.55 : 1,141.37 = 687.11 : x
  2. Step 2: Convert to fraction form
    760.55/1,141.37 = 687.11/x
  3. Step 3: Cross multiply
    760.55x = 1,141.37 × 687.11
  4. Step 4: Simplify right side
    760.55x = 784,243.31
  5. Step 5: Solve for x
    x = 784,243.31/760.55
  6. Step 6: Final answer
    x = 1,031.15

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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.