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Finding the Fourth Proportional to 926.05, 1,388.61 and 309.54

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Solution

The fourth proportional to 926.05, 1,388.61 and 309.54 is: 464.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.05 : 1,388.61 = 309.54 : x
  2. Step 2: Convert to fraction form
    926.05/1,388.61 = 309.54/x
  3. Step 3: Cross multiply
    926.05x = 1,388.61 × 309.54
  4. Step 4: Simplify right side
    926.05x = 429,830.34
  5. Step 5: Solve for x
    x = 429,830.34/926.05
  6. Step 6: Final answer
    x = 464.15

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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.