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Finding the Fourth Proportional to 661.10, 992.00 and 429.93

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Solution

The fourth proportional to 661.10, 992.00 and 429.93 is: 645.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.10 : 992.00 = 429.93 : x
  2. Step 2: Convert to fraction form
    661.10/992.00 = 429.93/x
  3. Step 3: Cross multiply
    661.10x = 992.00 × 429.93
  4. Step 4: Simplify right side
    661.10x = 426,488.41
  5. Step 5: Solve for x
    x = 426,488.41/661.10
  6. Step 6: Final answer
    x = 645.12

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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.