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Finding the Fourth Proportional to 687.77, 1,031.54 and 322.59

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Solution

The fourth proportional to 687.77, 1,031.54 and 322.59 is: 483.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.77 : 1,031.54 = 322.59 : x
  2. Step 2: Convert to fraction form
    687.77/1,031.54 = 322.59/x
  3. Step 3: Cross multiply
    687.77x = 1,031.54 × 322.59
  4. Step 4: Simplify right side
    687.77x = 332,762.88
  5. Step 5: Solve for x
    x = 332,762.88/687.77
  6. Step 6: Final answer
    x = 483.83

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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.