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Finding the Fourth Proportional to 928.65, 1,392.30 and 380.55

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Solution

The fourth proportional to 928.65, 1,392.30 and 380.55 is: 570.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.65 : 1,392.30 = 380.55 : x
  2. Step 2: Convert to fraction form
    928.65/1,392.30 = 380.55/x
  3. Step 3: Cross multiply
    928.65x = 1,392.30 × 380.55
  4. Step 4: Simplify right side
    928.65x = 529,839.77
  5. Step 5: Solve for x
    x = 529,839.77/928.65
  6. Step 6: Final answer
    x = 570.55

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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.