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Finding the Fourth Proportional to 784.64, 1,176.96 and 613.76

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Solution

The fourth proportional to 784.64, 1,176.96 and 613.76 is: 920.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.64 : 1,176.96 = 613.76 : x
  2. Step 2: Convert to fraction form
    784.64/1,176.96 = 613.76/x
  3. Step 3: Cross multiply
    784.64x = 1,176.96 × 613.76
  4. Step 4: Simplify right side
    784.64x = 722,370.97
  5. Step 5: Solve for x
    x = 722,370.97/784.64
  6. Step 6: Final answer
    x = 920.64

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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.