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Finding the Fourth Proportional to 691.50, 954.62 and 455.79

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Solution

The fourth proportional to 691.50, 954.62 and 455.79 is: 629.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.50 : 954.62 = 455.79 : x
  2. Step 2: Convert to fraction form
    691.50/954.62 = 455.79/x
  3. Step 3: Cross multiply
    691.50x = 954.62 × 455.79
  4. Step 4: Simplify right side
    691.50x = 435,106.25
  5. Step 5: Solve for x
    x = 435,106.25/691.50
  6. Step 6: Final answer
    x = 629.22

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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.