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Finding the Fourth Proportional to 661.79, 993.59 and 455.85

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Solution

The fourth proportional to 661.79, 993.59 and 455.85 is: 684.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.79 : 993.59 = 455.85 : x
  2. Step 2: Convert to fraction form
    661.79/993.59 = 455.85/x
  3. Step 3: Cross multiply
    661.79x = 993.59 × 455.85
  4. Step 4: Simplify right side
    661.79x = 452,925.72
  5. Step 5: Solve for x
    x = 452,925.72/661.79
  6. Step 6: Final answer
    x = 684.40

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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.