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Finding the Fourth Proportional to 929.30, 1,392.98 and 312.80

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Solution

The fourth proportional to 929.30, 1,392.98 and 312.80 is: 468.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.30 : 1,392.98 = 312.80 : x
  2. Step 2: Convert to fraction form
    929.30/1,392.98 = 312.80/x
  3. Step 3: Cross multiply
    929.30x = 1,392.98 × 312.80
  4. Step 4: Simplify right side
    929.30x = 435,716.79
  5. Step 5: Solve for x
    x = 435,716.79/929.30
  6. Step 6: Final answer
    x = 468.86

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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.