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Finding the Fourth Proportional to 946.81, 1,420.89 and 426.79

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Solution

The fourth proportional to 946.81, 1,420.89 and 426.79 is: 640.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.81 : 1,420.89 = 426.79 : x
  2. Step 2: Convert to fraction form
    946.81/1,420.89 = 426.79/x
  3. Step 3: Cross multiply
    946.81x = 1,420.89 × 426.79
  4. Step 4: Simplify right side
    946.81x = 606,421.64
  5. Step 5: Solve for x
    x = 606,421.64/946.81
  6. Step 6: Final answer
    x = 640.49

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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.