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Finding the Fourth Proportional to 926.33, 1,389.34 and 309.95

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Solution

The fourth proportional to 926.33, 1,389.34 and 309.95 is: 464.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.33 : 1,389.34 = 309.95 : x
  2. Step 2: Convert to fraction form
    926.33/1,389.34 = 309.95/x
  3. Step 3: Cross multiply
    926.33x = 1,389.34 × 309.95
  4. Step 4: Simplify right side
    926.33x = 430,628.63
  5. Step 5: Solve for x
    x = 430,628.63/926.33
  6. Step 6: Final answer
    x = 464.87

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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.