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Finding the Fourth Proportional to 687.91, 1,031.50 and 362.47

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Solution

The fourth proportional to 687.91, 1,031.50 and 362.47 is: 543.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.91 : 1,031.50 = 362.47 : x
  2. Step 2: Convert to fraction form
    687.91/1,031.50 = 362.47/x
  3. Step 3: Cross multiply
    687.91x = 1,031.50 × 362.47
  4. Step 4: Simplify right side
    687.91x = 373,887.81
  5. Step 5: Solve for x
    x = 373,887.81/687.91
  6. Step 6: Final answer
    x = 543.51

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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.