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Finding the Fourth Proportional to 687.56, 1,031.85 and 427.93

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Solution

The fourth proportional to 687.56, 1,031.85 and 427.93 is: 642.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.56 : 1,031.85 = 427.93 : x
  2. Step 2: Convert to fraction form
    687.56/1,031.85 = 427.93/x
  3. Step 3: Cross multiply
    687.56x = 1,031.85 × 427.93
  4. Step 4: Simplify right side
    687.56x = 441,561.59
  5. Step 5: Solve for x
    x = 441,561.59/687.56
  6. Step 6: Final answer
    x = 642.22

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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.