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Finding the Fourth Proportional to 946.60, 1,418.64 and 426.40

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Solution

The fourth proportional to 946.60, 1,418.64 and 426.40 is: 639.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.60 : 1,418.64 = 426.40 : x
  2. Step 2: Convert to fraction form
    946.60/1,418.64 = 426.40/x
  3. Step 3: Cross multiply
    946.60x = 1,418.64 × 426.40
  4. Step 4: Simplify right side
    946.60x = 604,908.10
  5. Step 5: Solve for x
    x = 604,908.10/946.60
  6. Step 6: Final answer
    x = 639.03

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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.