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Finding the Fourth Proportional to 928.63, 1,392.58 and 408.65

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Solution

The fourth proportional to 928.63, 1,392.58 and 408.65 is: 612.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.63 : 1,392.58 = 408.65 : x
  2. Step 2: Convert to fraction form
    928.63/1,392.58 = 408.65/x
  3. Step 3: Cross multiply
    928.63x = 1,392.58 × 408.65
  4. Step 4: Simplify right side
    928.63x = 569,075.77
  5. Step 5: Solve for x
    x = 569,075.77/928.63
  6. Step 6: Final answer
    x = 612.82

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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.