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Finding the Fourth Proportional to 926.80, 1,390.12 and 310.52

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Solution

The fourth proportional to 926.80, 1,390.12 and 310.52 is: 465.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.80 : 1,390.12 = 310.52 : x
  2. Step 2: Convert to fraction form
    926.80/1,390.12 = 310.52/x
  3. Step 3: Cross multiply
    926.80x = 1,390.12 × 310.52
  4. Step 4: Simplify right side
    926.80x = 431,660.06
  5. Step 5: Solve for x
    x = 431,660.06/926.80
  6. Step 6: Final answer
    x = 465.75

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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.