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Finding the Fourth Proportional to 852.30, 1,176.20 and 479.28

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Solution

The fourth proportional to 852.30, 1,176.20 and 479.28 is: 661.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.30 : 1,176.20 = 479.28 : x
  2. Step 2: Convert to fraction form
    852.30/1,176.20 = 479.28/x
  3. Step 3: Cross multiply
    852.30x = 1,176.20 × 479.28
  4. Step 4: Simplify right side
    852.30x = 563,729.14
  5. Step 5: Solve for x
    x = 563,729.14/852.30
  6. Step 6: Final answer
    x = 661.42

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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.