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Finding the Fourth Proportional to 671.76, 928.80 and 613.44

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Solution

The fourth proportional to 671.76, 928.80 and 613.44 is: 848.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.76 : 928.80 = 613.44 : x
  2. Step 2: Convert to fraction form
    671.76/928.80 = 613.44/x
  3. Step 3: Cross multiply
    671.76x = 928.80 × 613.44
  4. Step 4: Simplify right side
    671.76x = 569,763.07
  5. Step 5: Solve for x
    x = 569,763.07/671.76
  6. Step 6: Final answer
    x = 848.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.