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Finding the Fourth Proportional to 862.05, 1,189.58 and 512.67

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Solution

The fourth proportional to 862.05, 1,189.58 and 512.67 is: 707.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.05 : 1,189.58 = 512.67 : x
  2. Step 2: Convert to fraction form
    862.05/1,189.58 = 512.67/x
  3. Step 3: Cross multiply
    862.05x = 1,189.58 × 512.67
  4. Step 4: Simplify right side
    862.05x = 609,859.42
  5. Step 5: Solve for x
    x = 609,859.42/862.05
  6. Step 6: Final answer
    x = 707.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.