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Finding the Fourth Proportional to 717.64, 989.76 and 484.72

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Solution

The fourth proportional to 717.64, 989.76 and 484.72 is: 668.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.64 : 989.76 = 484.72 : x
  2. Step 2: Convert to fraction form
    717.64/989.76 = 484.72/x
  3. Step 3: Cross multiply
    717.64x = 989.76 × 484.72
  4. Step 4: Simplify right side
    717.64x = 479,756.47
  5. Step 5: Solve for x
    x = 479,756.47/717.64
  6. Step 6: Final answer
    x = 668.52

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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.